CCNP交换（300-115）考试新题汇总（5月24日更新）

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1. What is the Ethernet frame size for 802.1Q?
a. 64
b. 128% r. {" o- L4 B
c. 1518, T4 V, S" B5 m' v  d( v& ]# X! I
& k& I8 _( O  ~( R: ?4 L( id. 1522 **3 A/ H) |7 p+ I: Z/ [0 F6 I6 I
' }6 E, P% f+ p. L/ gAns: D! T: v- a' K/ D" ~, R7 C
————————————————————————————————————————————————————————————% x2 D3 i1 {% M
2. How will the traffic reach the core switch from AS switch to DS core switch?
+ j( l6 N4 d3 A8 x, N8 r4 B(Based on a topology shown with one core, two distribution and two access switches on each distribution switch, with redundant links and bandwidth mentioned.)
a. ASW1 to DWS1 to core" |& U& h: U( s" P  P
b. ASW1 to DWS2 to core **
& ]9 D6 B4 q5 pc. ???
d. ???9 G( v6 J/ w1 B0 w) |- c* H9 b
Ans: B
7 O8 e; s& |+ e% l# H( g. Q————————————————————————————————————————————————————————————# q& M0 M% [6 K$ k9 p7 m- V
3. If HSRP group number is 45 what would be the MAC address?
3 R  v( X7 v- @(Basically conversion of digit to hexadecimal with group of 16.)
a. 00-00-0c-07-ac-2D
b. ???
& [9 N+ @/ U  h/ \" o6 W, M7 b9 G/ ^c. ???7 j" n; L6 `4 ~0 _, k
d. ???1 T, R% o" e9 f1 h2 }
4 E7 F1 ^5 o' ?: f8 m8 ^" jAns: A2 M+ A' l5 F% O3 M
Explanation:4 e1 T% S) S* j" c  i4 M: u
00-00-0c- 07-ac-2D1 E+ L' Q% e6 O1 f
CISCO_ID :HSRP_ID:GROUP_ID
2d=45
: |+ A' g3 c. m————————————————————————————————————————————————————————————
5 c4 s+ Q6 p4 a& k- M) M* |# }; r4 A question on EtherChannel misconfiguration…….3 y: }) c# ?  @3 A
7 d3 p8 E' k5 J3 M1 S$ la. Enable this feature by using the spanning-tree etherchannel guard misconfig global configuration command. **
6 e0 i2 k  d' y* Z& g; A+ Cb. ???/ J9 {" l+ U5 L2 W; r
c. ???
! B4 H! m# f) C9 dd. ???
- b  w2 I8 a& [, K( VAns: A7 o$ P, J3 n; W  V; j1 I7 r
————————————————————————————————————————————————————————————
5. Select a valid VRRP configuration from a list of possible configurations.. r$ h! ~; u9 W) _. f7 @0 G1 E* B
a. vrrp [group-number] ip [ip-address] **0 M$ N: h2 K  v  ]' j
* G" x6 X  D( `; X6 jb. vrrp [group-number] priority [priority] **
c. vrrp [group-number] preempt **
0 B; b0 z/ a, f# b2 L" \d. ???7 K  ~( |- S' W3 [* F
" a+ A5 E$ P4 D2 x  f3 t: le. ???
, u# o) j- E: I2 o) \, F" gAns: A,B,C
- S) Q0 d. R9 {3 zExplanation:
  [' V% m: M5 |( K8 NYou can eliminate configurations with the word ‘standby’, as that would be HSRP, not VRRP. Also, I think the options that put things like vrrp group 1 ip x.x.x.x are wrong. You don’t need the word ‘group’ in the configuration line. The number 1 is the group number. Anyway, just take a good look a t a few valid VRRP configuration examples so that you will be able to recognize invalid ones., I& j  ~+ W1 j9 p
! P1 {/ O, V; A2 Y; V9 l# |————————————————————————————————————————————————————————————
  n8 t: T) h  J7 l' `/ ^8 W6. Private VLANs (PVLANs) have two secondary VLAN types.
a. community **4 o& E) F5 c% M" ^/ p/ ^
4 L/ |8 v/ ~4 d% H5 B7 wb. isolated **
c. ???
* v3 m% I& I# Y2 A3 Ud. ???
e. ???) Q4 a6 Z* W% H. N/ b9 }
. t7 ~& F; B: T9 MAns: A,B
____________________________________________________________
7. What types of SDM templates you can use in switch? (Choose three)) g% d1 H  o+ H5 B
a. Access **- @3 r* E7 L, g8 G* c
3 X- z# ?: B( T" Z  `4 t, [0 Mb. Default **0 z  i  r8 ?9 |! b6 X* t" F
c. Routing **# e5 r3 K  X7 v9 _
d. VLANs **
; K* R0 O& z% w' w  he. ???8 c3 N# u9 m) ^7 _$ \9 |) }! @6 E
f. ???
Ans: A,B,C,D (note: the question asks for 3, so 3 of the 4 correct options should be in the real exam)
" k# y5 G7 l! O0 k- ~) _6 KExplanation:6 a& J( `( K/ w+ Z3 @+ v
% X! o: H8 W* i( f# n  B* o" r$ k+ Access – The access template maximizes system resources for access control lists (ACLs) to accommodate a large number of ACLs.7 |# X; m  a+ ]3 I& J
$ O9 l: u! K6 s+ o: d+ Default – The default template gives balance to all functions.8 y! e' A8 [9 _# f: k" g
. S& M7 x$ o6 G' W" ^/ }6 _+ Routing – The routing template maximizes system resources for IPv4 unicast routing, typically required for a router or aggregator in the center of a network., W' {' ]0 N0 O- k6 d- B$ _9 d* J
1 }: ?# n$ g/ u+ VLANs – The VLAN template disables routing and supports the maximum number of unicast MAC addresses. It would typically be selected for a Layer 2 switch.! w, }. u" b0 |& V+ k5 u$ \$ }' U
____________________________________________________________
8. EtherChannel – what is the process to configure EtherChannel.. T" }/ Q) E: T) w
a. shutdown both interface ports **
" P4 ^8 }' v. p% f* c6 U4 o" Fb. shutdown the interface on one side only0 `% p# b7 O- T# \
c. ???; G* s, C3 C2 n
6 B! e: _! z  H+ i% Q& {! h4 ed. ???5 f: Q, k9 }" l
Ans: A; e. [1 T. y& d; y
____________________________________________________________) o$ y9 O/ y2 j& M( z; u) A
" f, {9 _2 E0 P0 b2 ^% E# A9. A question about spanning-tree port-priority.: k, a- u. G- C/ h1 c- y2 e+ h
! w# @$ W6 [8 m, U+ t% Fa. 127 **
2 C; x& M% V3 {" G8 w& Ab. 129$ b; m+ x( ]- N
7 f, M% Y; s) M0 n1 Ac. ???4 P3 E- q0 T, H8 }" I7 u
d. ???1 A- q' b, j- w3 ], U4 i' K+ `
* Z0 a1 w+ V. E! @' rAns: A
____________________________________________________________
. c; H4 v  D( T: s: w+ j10. Question about EtherChannel based on STP EtherChannel misconfig……: F& F; @; r$ E8 r3 @  Z
a. (config)# spanning-tree etherchannel guard misconfig **
b. (config-if)# spanning-tree etherchannel guard misconfig% D5 x! V" `4 s6 ]9 N+ x
3 U9 E0 t7 a  |$ D0 o( A- j, w/ ec. ???
4 c6 R5 l# Z, `d. ???- u0 P& H$ o- g
Ans: A
) g0 b- t' L2 K7 V) m  S# t________________________' `- F1 ^* j: `5 {9 b

$ b9 f3 c7 k$ R# u* j6 z# z& {2 m
7 P* v5 l3 t$ l! i4 X___________________________________
11. If HSRP group number is 37, what would be the MAC address?: z0 a  C; U% x  {! O2 V4 Q
3 K. ^& m$ d0 e$ f1 U" ?a. 00-00-0c-07-ac-25: ^0 S; X; [5 q  w6 E
b. ???" y; E# m" n% T7 I, C& K3 ]
c. ???' u! o- C' J7 o2 p  K: }- r
  @( ?* S- f( ]" q, h+ ]8 }/ vd. ???
Ans: A! ~* k3 k8 O) V& l, K
____________________________________________________________
9 n1 E4 A0 v& l. h; Y* e12. What is the default value for spanning-tree port-priority?) L0 U' f2 {, _2 a6 v7 i7 a/ P- t
a. 128( s. O+ U* S$ [
b. ???$ b' t  Q2 V' B  D6 T9 }/ @
* j) i5 ~/ v3 i( R9 hc. ???; D9 O1 y) r1 F% a! D) U
1 B, E" i! K. ~$ ~d. ???) M7 j0 p8 P/ B# p& `5 T
, c% g( `, D5 J& OAns: A; w/ G+ a2 J, B4 T! a' E
$ I  L. Z8 ~  y  q6 [' {" d; ~$ p9 g____________________________________________________________! m$ u6 w3 F- l/ p& i
13. Which information does CDP supply from connected devices?
a. hardware platform, interface ID, hostname
b. ???
c. ???: P( @- s$ b  N+ e* @6 T- K5 ?, O
d. ???
6 S1 o7 ]$ s6 t/ t* M0 k+ T" X$ HAns: A
____________________________________________________________
2 o. g4 C9 K5 e' a3 r14. If EtherChannel guard is configured, how the interface status is (or looks like) if misconfigured?, j: s# a8 L$ K! `2 L! r  C9 C
a. errdisabled
b. shutdown$ ?4 W3 ?, |( H
) Z5 R$ a* y4 t# E  Z% s/ `5 I! ]c. ???5 \, q4 E( a* {5 c$ D" e
# `9 L* |$ i* j1 K9 q2 md. ???
6 _  F7 c: g$ O: C; G& B% eAns: A# Q4 _9 B) G9 H0 ^' w# F1 V4 H( ?
____________________________________________________________& }6 c# A- _9 E0 z' x- Z
- H# S+ E5 ~8 q6 q' e/ c4 q15. When you configure PVLAN to the portal facing to the router what kind of ….. should be?
a. isolated6 T; N- b, u: K+ y! ?: T4 C2 A
  \! j  c' R: Z4 I/ r, a) M( Jb. promiscuous
c. ???
d. ???- j. L- C% f; R1 ?. O) i+ W/ W$ U" U
Ans: B
____________________________________________________________# J8 I* b$ ^2 `5 D& p
16. A question with an exhibit./ k8 m5 y3 |3 y0 S
9 b+ N- `: K' g/ A& Q& E. Q6 \There are 2 SW and 2 PCs. There is a trunk with VLAN 1 and 5 allowed. Question is if you do “switchport trunk allowed vlan 2,3,4” on SW2, what happens. Ports towards PCs are in mode access VLAN 5.
a. The connection is lost between PCs, because you will remove VLANs 1 and 5 from trunk with this command. You should use “switchport trunk allowed vlan” to add additional VLANs into trunk.
& u! Z2 N& C- k7 m. ^! Zb. ???$ @( r! z; t' D( T1 P3 U
c. ???# U/ |0 z6 o% A# F8 [
4 ]2 f, ?% i. ^% ud. ???, Q( C, t) E8 v" L5 s
Ans: A* Z5 e, E5 ?  p2 ^! U! I5 x
( Q* c6 g. b- O8 p1 I____________________________________________________________$ n6 r$ |: O' `: s* _
17  Which option TPI 802.1Q tag?
5 \. v% E! c- ]; ?! s. U6 H7 Ua. 0x0806
b. 0x888E
c. 0x08009 n9 N/ e; m: `$ Y
9 A: ]; K8 O: Pd. 0x8100 **6 G! R0 z8 A/ i1 A4 D5 G* x; |
: X8 a- V4 ?$ iAns: D6 E( Y+ d5 O7 a' V: |
____________________________________________________________9 g- H  Q: V1 n" }$ s9 V
1 y& x" n; z- w18. MAC address filter?! K& i6 S4 C- v: Z
a. CPU-destined( r& T! c  E+ O6 g( {
. T- O& D& u7 U& n3 pb. router9 b& i0 y6 v- R7 s" b: o( g- g
c. unicast **" }5 G, Y4 M4 k- b8 H
d. multicast
Ans: C
' u7 X8 P  `" Z  \____________________________________________________________
19. Question about what would be, if write command “switchport mode trunk portfast”? (I don’t remember properly)
. a! v# O5 f( n4 }4 @3 na. trunk port will be immediately
b. trunk port can be portfast mode
c. BDPU turn this port to err-disabled **
d. ???
7 o# F* v; K! O5 XAns: C5 V2 K% \4 r6 g5 G
3 [0 E# c; a/ E+ h  b& c1 U# k0 V____________________________________________________________
3 Q: N/ E/ i! Q! J6 c20. Question about root guard…." [- Z( H5 A' r* M; I9 T: B
a. Prevent unknown switch be a root port0 C8 C& s/ M5 f2 t# F# ^1 f% f
% f( f2 l: G- s- q. E9 Lb. Root-inconsistent **, i5 Y. t6 r7 o
' H& C2 s7 D- g3 U% v# t* Uc. ???
d. ???
: E% Q, x8 O" Y. l! iAns: B
0 ]; U6 F1 Y# B3 q7 a____________________________________________________________
21 Question about Loop guard configure……..
; k+ ]/ U, p1 |# ga. (config)#spanning-tree loop guard default
. }& O9 g; |4 _; {9 @b. (config-if)#spanning-tree loop
# k1 M1 Y& ?1 v! j4 i3 U+ k3 qc. (config)#spanning-tree loop-guard default
0 s7 y' z+ ~/ C4 z( F  zd. (config-if)#spanning-tree guard loop **
. m5 i# N; m1 A6 m9 ye. (config-if)#spanning-tree ??????% v/ w: O* }  @) S
Ans: D
____________________________________________________________% I( o) p/ n2 e: N7 E
$ ]* `8 J( n; d# Y7 l" f4 H' i22. VMPS question – a dynamic access port is member of which VLAN by default?
a. VLAN 1 is the default VLAN **
: ~' J( A& U# C% |. s  ~; q, y0 \b. none until the port VLAN is determined) }# m6 C& L" M4 k& r% w5 k9 \
7 X. e% c$ @* L/ Y! v& x8 H+ P& a2 s9 Cc. ???
% w5 a  m: C$ T3 @d. ???
* `8 r" _+ a/ v, J, _! m, GAns: A  L) h( u0 t7 F
; T/ L. o2 I3 h+ u____________________________________________________________
23. Question about the behavior of an access port when a tagged packet is received.
a. packet is dropped.3 |$ ?; c  V  \  I- [- o) a
b. tag is removed and packet is forwarded on the VLAN of the access port. **
c. tag is removed and packet is forwarded to the VLAN mentioned in the tag.
$ }8 s; D( N" r6 y. V& r4 vd. ???% E9 @( D4 [1 Z/ S1 ]
  t1 w  H4 ]; \8 r7 L7 E  ]Ans: B
+ d- L* w) G  s0 u" f2 X! l1 b3 X0 N____________________________________________________________
24. What is an extension of HSRP that allows load sharing between two or more HSRP groups?' ^+ k  L4 z2 _
& o% u; w1 X! E. t4 Ya. ???' k8 _2 g3 k& P9 S& Z, j
) q2 E2 q) m3 u  i5 H- |% Kb. GHSRP
4 f" h% z" C2 A! A/ S  P# z# Nc. MHSRP **
d. GLBP
# Y9 |" Y6 _0 W5 C: {' Pe. ???+ {1 [4 O, I& t  _* a0 N
f. ???+ ?" |! y% u4 ]  @8 E4 `
6 l7 ^, W8 e0 t; zAns: C4 S' B" ^3 o" o; D
3 h* z4 Y( G# z____________________________________________________________
25  A question about RSPAN.7 F0 a) n7 d3 ^8 H* c: N4 u
, F6 H% a. G+ H+ ja. vlan 4029 remote span( }: o8 @! c6 M+ a& x$ u' Q
b. vlan 510 remote span **5 U" U7 v& \5 Q( A) G6 y
' s* h5 S" D0 l$ Vc. vlan 510 span
6 I! z. Y2 p! A* I. Ud. vlan 4029 span* r3 p# c' z% n0 D" |5 H
Ans: B
____________________________________________________________
4 |! P0 {, E4 Q& ~% L& p; e26. A question about configuring spanning-tree port-priority based on a diagram.+ y/ T$ l. A7 K+ g+ C
a. (config)# spanning-tree port-priority 127; p* f( \/ ^0 f# [
b. (config-if)# spanning-tree port-priority 127 **
c. (config)# spanning-tree port-priority 129; b8 |: V% k1 t0 m
d. (config-if)# spanning-tree port-priority 129
Ans: B, {2 t0 B- Y& I( P$ f2 }% Y) h/ P& c
____________________________________________________________- M6 S: K3 G, @+ X# @. F! f) l
" }1 C9 y6 Y' a9 f27 . A question on EtherChannel misconfiguration.
: b) u) j1 q' N2 [a. PortFast
/ c# @; @) @6 \8 }: @+ i4 cb. PAGP
c. LACP
4 m* C4 ^5 C/ f% C  B" `$ [6 K5 td. STP **6 Z* _4 A# v2 }- l' X. [* g" N+ G# {
Ans: D2 L  |9 U2 c1 t
____________________________________________________________
$ p6 A5 V# n3 K" ?7 {- A' R28. A question on local database for consoling to network devices. (Choose two.). H/ G5 W' g8 d7 d1 x  ?7 p
a. Console is a backup authentication method **/ `' M; ^: T- m3 x' ^
b. Console is the only backup authentication method
c. You can set user privileged levels **
1 Y9 O1 r& Q3 U( J/ y8 r7 bd. ???8 W. I0 X& o% R6 B" F6 k. O. a
Ans: A & C8 d) h, D5 S9 y
29. Drag and Drop – STP Timers
Hello
( C1 e. C# \$ w5 S– 10 seconds9 Q! |# h3 t% u4 T9 y) d0 |
– new BDPU
7 H$ h' N& {+ B& d$ vForward
% O& N" T# P6 R; O0 s– 15 seconds
– listening or learning! t4 E$ G0 N+ A& p; h% Y1 A
Hold0 d; B# O& h; R/ g) g
– 20 seconds
– time when BDPU expires
____________________________________________________________
. d3 u9 c8 ~. l5 V" r* b7 t30. Three reasons for err-disable. (Choose three)
a. storm control **
b. security violation **
/ }) ^: ?( D3 c4 j6 Kc. configuration ports into EtherChannel. y1 I( Y& [  i/ F0 m
d. BPDUguard **8 S; ~+ m/ ~8 v% u% h+ g
e. ???; P% Q4 b; J( M
f. ???) C% G% u" {/ S3 y6 X) D
. Z# k; T3 N7 Z, @% v+ h  fAns: A,B,D/ O/ N% ]- Z) l0 r8 }* G
+ v/ q( h6 |- ^' h& N% L3 l# y____________________________________________________________, w" ?/ `3 R. i  S+ O% A" }4 e
2 a$ M4 w" i: W& b+ q" q" H31. RSPAN what happen after configuration.
; h3 g- A$ S9 T( g7 d- Ja. destination port is unusable for normal use **# J! @  w) W+ Y) C; P
  D+ ?8 ~# u0 \0 p4 Y8 n& r* Vb. traffic in network is doubled2 {* ]# v$ w' S# C$ Y8 m
c. ???, {  g4 Z1 _, ?$ B. J. _1 S
d. ???
Ans: A4 i+ E! @: a) \% ~9 I
____________________________________________________________" F3 r" J: H/ ^% H0 R5 q
32. A question on local user database for login to network devices. (Choose two.)
* Q  l" k. N) b% y) t3 j& D- oa. Local user dbs can be main and also backup authentication method **: b4 c. o- H7 P, Y
b. Local user dbs is the only backup authentication method/ \+ T/ Z, q4 u, v& [/ V
c. You can set user privileged levels **
d. Local user dbs is used after 3 unsuccessful logins via RADIUS server
e. ???  H! a8 R" N, L& r
% u+ L( C- u6 N9 XAns: A,C9 m) Q, W" y4 u- v
____________________________________________________________
33 Which switchport feature will block the packet with unknown MAC address from sending it via port.5 q, B( {/ v+ v. n7 U
a. switchport protect8 ~' v( f$ B1 {6 U" G7 C
" N+ ~) v& X" R& h  U( ob. switchport block unicast **3 x, h8 H& E( f# Z
' {% P  O% r- {  Y2 O; b; `& R& lc. switchport portfast
, u% s* F( M2 y  [d. packet with unknown MAC will be dropped
Ans: B
* N% X$ W! Z4 Z" k' P; l' c, J____________________________________________________________. D$ Z# o; f, t7 a9 C& n/ J
* z/ j* B' S# D, p" \34. What are the two ways to configure loop guard?
1 a. j& d- e% ^" d& ]a. (config)# spanning-tree loopguard default **$ s4 \4 F- o! o; H) X. w- r2 L
b. (config-if)# spanning-tree guard loop **
c. ???
5 a- L3 E3 m2 O: Fd. ???
( B; {$ Q! Q1 F2 h0 n: ~8 ^, Oe. ???/ K* C, n5 k/ W3 t2 n& v3 j
% K0 W) H  N" M) v0 ]! m) K1 _+ XAns: A,B( b3 `3 S: ]4 ]1 Y: k* T
. M, c! ^8 [- x: i/ f$ |2 ]____________________________________________________________8 a" U7 X$ J% X% `4 Q
35. Question about action of DAI with invalid IP-to-MAC. (Choose three)
a. Intercept **
* R; O/ j( r. y7 c( Eb. Drops **
1 F, D) h7 |+ x( M& ~3 W0 [" Wc. Log **
d. ???
e. ???
Ans: A,B,C; e: ?$ w$ P1 A: b; w3 z" m# x
____________________________________________________________
- ~, M5 U. h% b+ `4 V2 r" X36. Question about what are RADIUS server responses. (Choose three)* g. |- e& G: T$ o/ j. {
a. Accept **
1 U* T8 \6 p: V! Lb. Reject **
c. Challenge **5 H5 S  B+ B% ^' w3 `  `, q5 P
d. Get Password
4 B. P: ~3 b9 ]' O' @e. Cancel/ G8 H* f, z* r. t3 ^" }
f. ???8 C8 w: ^( w$ E9 k0 p# W
6 n+ Q# r- d3 {- U$ ?Ans: A,B,C
' {' H2 R4 z. O" S; g( w; B% i
, A0 V3 r2 ?/ B" V  M3 t6 _9 b
' N+ J6 l! j$ ?6 C5 u/ ?! t+ w( V# E9 ^! `

37 What happens if a switch with dhcp snooping and ip source guard enabled globally, what does the switch do when it receives a packet with option 82?
a. Drop0 p% {2 k; h" y/ |6 R( f/ h( a
b. Remove 82 and forward **
c. Proxy ARP8 Z7 d2 b  V% P
6 M# F- z/ P; |% x# A! O" K' X5 dd. ???& [- ^* S5 v' `0 A7 `" u
# Q. l/ x0 t6 c7 }9 ?' NAns: B
7 F$ z# r$ f& Q1 L( N5 C8 h____________________________________________________________6 P% w5 g0 k0 j
* N9 J5 j2 @, i2 X8 \38  Option 82 question with two choices. (Choose two.)
a. Layer 2 ingress **0 m3 N1 Z$ y. D! X# H
b. Layer 3 egress **
c. ???# D4 z! c5 }) P& s6 R5 p& f  n: _
d. ???
$ c( n. p+ i8 V7 z1 K! F+ ?1 t# zAns: A,B
____________________________________________________________/ M# B+ `7 F  [& l) J
- O% y, S/ |  ?6 z0 l3 Q) a) c0 K+ [39 . Drag and Drop – Port Priority/Switch Priority/Path Cost8 o  f; T( r; V# \
Port Priority% \0 p$ _/ ]& h5 }' R
$ K0 c8 N" k/ a– By default port priority is 128" {1 Z! g2 a- H2 b* I* Y0 \, L
% c  V+ J# V+ x– Lower port priority most preferred path to root
– Value from 0-240
– Multiple of 16 <—– this was there7 x7 d' l2 n; C9 p+ }* q' e8 w
Switch Priority( H7 u5 r, r. z7 ~5 R; b2 C
– Lower priority is better to be root bridge* P; f+ [7 b3 Y3 ^6 v# |; ]
– Multiple of 4069 <—– this was there
, \: S8 z6 d. P: Y1 `/ s, F– Lower bridge priority is root bridge
1 Z2 C3 V9 k) v. W3 [5 ]8 @4 `! ?Path Cost
& o7 H% u" k! w& q7 z; |1 c8 X6 r– Cost depends of link bandwidth <—– this was there8 q6 ^  d' z3 \& U8 r1 u# `% z
/ O& Q  M0 I) l6 V/ ^– Lower cost value is better <—– this was there but it can be draged to any of them
– If you change the cost on an interface of SW1 then only SW1 will learn the change
– Short range — The range is from 1 to 65536.
– Long range — The range is from 1 to 200,000,000.( D; ~" e! `9 {) K' a; Z' K
____________________________________________________________8 N- g' R6 P0 a& n0 z
40 . Which three functions does Dynamic ARP Inspection perform with invalid IP-to MAC address bindings? (Choose three.)
a. deletes% m; p: s$ ~# v$ K; g9 p9 u2 B
! a0 n" O2 a9 L: c) T/ e+ x2 _b. logs **' N! q/ L6 {) x2 i4 `$ E, m! J1 i6 M
! u4 B7 G9 S% l/ u# s9 fc. accepts
d. intercepts **( k2 t, M/ K! L9 [7 x
% h% }9 W& }; w* J& K0 Ye. discards **
f. bypasses
Ans: B,D,E* ]" R% F, q- g6 s
____________________________________________________________
41 . Which three features can be optimized by using SDM templates? (Choose three.): H; c& j7 c( F6 ~7 F
a. port security
b. trunk3 x% c% I% W  Z9 i, A
c. VLAN **& b( u0 O0 a! @" i0 h9 `
d. access **
5 P3 l: H% j: f4 ze. DHCP snooping
3 Q; L+ _. B% M3 u& gf. routing **; h0 `# r, ]1 _% [1 c
( ?9 o/ I1 c( x, m+ NAns: C,D,F
3 H. r( o, t# u' d* j  J- N____________________________________________________________
9 K3 G5 V1 t% ]( s) j42 . If all devices on an EtherChannel are sending traffic to a single MAC address, which two methods of load balancing on the EtherChannel are preferred? (Choose two.)
a. destination-MAC
! s1 y  t" j% Sb. dest-source-MAC8 Q$ ]% }! I* h6 }1 `" U" z
( v! o- V, G) f6 \" cc. destination-IP& [3 I& I; b* T9 u6 D
d. source-MAC **$ I: z" I0 q) d. a% l+ s* |
  l  b0 F2 j/ ^$ `+ qe. source-IP **
% t* y1 P5 E$ t# @8 y; gAns: D,E
( s& N' `' S0 ^1 [2 N$ X# A; n8 ?& I____________________________________________________________
43  Which command is used to verify trunk native VLANs?0 y. t" B( |3 C5 l" d4 D# F* j
+ i6 S. P' v/ V2 Va. show access ports
b. show interfaces trunk **0 i# w7 h  d# ?3 Q3 U
& p! I6 e0 Q% o) B9 Vc. ???1 @1 X. A, x3 u" s
d. ???
+ j& ^2 B% ~6 ^Ans: B
5 B- U/ L" \# Z0 x6 _! u____________________________________________________________% i; p8 r$ r) S. @
$ w5 G" n# }% x) E. v5 A44. Question about configuring VLAN 10 root bridge with spanning-tree switch priority. (Choose two.)
a. spanning-tree vlan 10 root primary **) ?2 B9 @) P0 [' C( ?
b. spanning-tree vlan 10 priority 4096 **
c. ???  _+ O& n: q* b& S5 w, A$ w
6 q& f5 ?* A! S' N3 td. ???+ _) Y: A6 U. B, p, j0 i) ]: B
  E) G) c8 o: j' qe. ???5 `4 Q3 S- P# P6 X  k
" L) z+ d9 J% \! y! hf. ???
" T. }+ `' r: _% Y- p" Q+ j2 }Ans: A,B, D/ g; S1 V" G% s, z
____________________________________________________________7 j- Z2 `7 \7 S: [
45. Which information does CDP supply from connected devices? (Choose three.)3 V5 e& A: |0 t
a. Hardware Platform **/ q: m3 T1 f8 h. m' U4 a9 \
b. Interface ID **
c. Hostname **
+ h' T* S5 C, M# F+ Y  R8 _: cd. Config Register3 m% j& D' K' p9 V0 I8 B
Ans: A,B,C
, P, [  C6 `$ ^. u) H, H4 g& B____________________________________________________________5 g8 J' ^  P# Y
8 R# ~2 a- m  S% b6 k) j; D7 Z9 Y
, X0 `( X( v' L9 g) m: t8 [
46  Question about voice VLAN.
a. Disabled by default **
b. Enters on untrusted port: b3 v2 n) g. c5 k
4 r; p% V+ J7 X- Mc. Default CoS value of 5 for untagged….. **! J# v# A4 z7 w0 V7 O) |8 }5 h+ D
d. Needs manual enable of portfast.
Ans: A,C6 e& @/ \7 G/ O8 G1 {
9 l9 I* Q2 H  f, _. z; A____________________________________________________________, K. h0 G8 _1 C/ ?- L: v
8 N- V+ G; g$ C47 . Question about UDLD aggressive. (Choose two.)- S0 s  f* A4 B) T
; t7 F, @: D" S0 X+ e. pa. UDLD messages are sent every 15 seconds. **
/ B" ?5 f' C( u1 M: K' Lb. UDLD tries to reestablish link once before declaring the link down.
c. When unidirectional fail is detected, port state is determined by spanning tree.. x2 d" g1 L2 g4 p
% @: W8 e+ R- Q" A0 {, ]- ^. Hd. When unidirectional fail is detected, port is turned to errdisable. **
e. UDLD sends messages four times the message interval by default.
( N( @/ R1 j; Z, u/ ?f. UDLD automatically … message interval based on configured timers.
# r& |& k; Y6 w8 LAns: A,D
2 D/ H) j, n4 E5 D____________________________________________________________
48. Diagram is: with 1 core, 2 DSW connected with EtherChannel, 2 ALSW, 2 PCs per ALSW. Per diagram current root for VLAN 10 is DSW2." R0 m# p( b9 J* k: P
/ N: X4 b! G' y1 G/ V8 ]& B' A8 A3 yQuestion is how to make DSW1 the primary root for VLAN 10. (Choose two.)/ L$ \, K8 {1 d$ Q/ i, m0 R! K% [( ~; C
a. DSW2: change bridge priority to 61440 (highest). **
b. DSW1: change bridge priority to 4096 (lowest). **' Y* `7 L% T$ P) x4 l* `6 ]: U
c. DSW1: change port priority but in global configuration mode.6 W$ z, b/ A1 b
7 R) w5 C6 K- O% N- Z1 qd. DSW1: change bridge priority but value is 0.0 Z1 L: L! F/ B, s- n2 j7 G
e. DSW1: change bridge priority but command is priority root.& o' m9 a+ x8 k
Ans: A,B
8 K+ J3 D+ b' ]: h* E. k+ P____________________________________________________________+ k: o/ U7 J6 d3 C7 T: r
49 . How to configure dynamic ARP inspection on a VLAN?
2 O; @, Z: Y* q! M# la. (config-if)# ip arp inspection vlan
b. ???
( a8 p2 y% \7 ~  Gc. ???
, H+ v, O. ~+ l3 Y0 v5 `% k: yd. ???( E7 O& T7 D6 S2 l
9 s9 V# o' ^# `0 C7 ]% `Ans: A
____________________________________________________________+ k2 G7 b, o8 b0 I8 R+ q
* r4 t' z0 K6 a5 K, }% V* ^$ I50. Drag and Drop – Port Priorities
% f+ j; k2 i! j+ \Port Cost
– 8 default is being the interface value" O- A% n9 c2 u& F2 ]0 _
– range 1 – 200k (200,000)
+ [5 p  N) E6 sSwitch Port Priority
! r$ c. p9 r$ F1 J. [– default value is 128
$ [. e! ^- }5 ]% E& M* @1 q3 c3 D– multiple of 16  Z! M( T# R) d$ b" h  P4 g
4 e  K; o4 I0 @* Z" l% _5 oSwitch Priority
: u8 L) E  [1 h) C& Q– lower the better) g' O* a0 B+ Z
& x" K' y: Q1 J& T' v1 ?– multiple of 4096
; x: c9 o; ]+ f: ~ldq_china，如果您要查看本帖隐藏内容请回复
_________________________________________________________
96. A question about the priority of a Stackwise switch.
(CONCEPT ONLY)6 G; [; B2 v7 \* \6 d! v2 C9 @
a. Master member is selected based on member’s priority. **
. W4 K6 O1 w& X6 ~7 A- \% x% Z$ Qb. ???* D2 R8 d, h2 r8 `7 K
c. ???
d. ???
/ L* N! T4 ^4 d' QAns: A8 l& ^, Y. ?; @3 L: a
  }8 y! y, X4 C* `' A+ v: M: m% K7 r, ?5 e2 U; }
  U6 e& x# k' f& ?0 F7 V97. What is the benefit of UDLD?* X5 J7 R* H: n, q- L4 ?9 z
a. provides backup for fiber
b. help in preventing loops **. y1 P2 h% ]6 |7 Y9 j
' e: y# Y7 z4 L* j& nc. removes loops
d. determines switch path# @. B1 N; B4 D! q3 q8 C% p
Ans: B) b: T# J+ }3 C* ?
% ?' o' R0 d' n7 G____________________________________________________________
98. When no spanning-tree bpdu guard enable is configured in f0/7, which is true?7 u& A6 O9 p: m; i7 {& J
(There’s an exhibit that shows f0/7 receive BPDU.)
a. We have to configure shutdown and no shutdown.! q' ?9 z, c( X
0 d4 B- C0 s& O3 w/ fb. Have to use errdisable recovery.
c. ???' x' H; E; ^1 C5 F; U
d. ???
Ans: A
! o6 o" \. z7 |( D, t1 b, J+ j# M/ x拖图题汇总：
1.        CDP / LLDP
CDP
&#8226;        Default time between protocol frames is 60 seconds
&#8226;        Supports IEEE 802.2 and 802.3 encapsulation% @0 V+ q! g0 n' D6 i2 H
, ]* }, P7 e2 \& _. T9 u# u&#8226;        Uses multicast address 0100.0ccc.cccc
/ D3 p! W+ U0 m% u) p- H: T7 w3 ^LLDP! {6 S1 z0 M' B' g. u
# g0 x  ~6 m  e0 a6 ?+ ]&#8226;        Default time between protocol frames is 30 seconds: a; e! }7 _0 q9 a& L6 q
5 s7 V* I2 [6 p, k&#8226;        Sends topology change notification
% J2 [2 r" Z) J* f6 X; t&#8226;        Uses multicast address 01-80-C2-00-00-0E+ C# i* E0 d6 f& k3 [! Y& S2 I2 Y" @( L
==========================================================6 |: r8 q  z/ f1 F( O8 z7 n
2.        BPDU Filter / BPDU Guard / PortFast
$ x+ Y3 J* H. y0 Z  H% S; l. _BPDU Filter
2 f% W. g7 Y$ H6 h8 z; A1 t* D&#8226;        Disables Spanning Tree on a configured interface
&#8226;        Protects configured interfaces from sending and receiving unauthorised BPDU frames# M7 u/ X" L$ i# v
  Z+ D- v3 n, ]0 i, m2 I  TBPDU Guard- _' U6 g/ z  u' e& \# M' O
&#8226;        Protects configured interface from receiving unauthorised BPDU frames. z( q, Q+ g4 m6 `$ E1 _
* s" ?) H1 W- y4 y  W; B3 d) {&#8226;        Shuts down port and places it in err-disabled mode
PortFast
8 f, }- U+ Y2 M7 J0 S&#8226;        Configured on access ports with a single host device
# D( G3 X- D, V4 n4 f6 v&#8226;        Configured trunk interface goes immediately to forwarding state from blocking state
& f. ?. n/ U  C3 U7 x0 p==========================================================( x* a9 \; v# c2 t  ^) P) q0 d0 e
5 W2 c1 E+ l( {% D3.        MSTP / PVST+ / Rapid-PVST+/ D! `: n) P/ I; K- Z9 b
# q4 U) i4 R6 Q! ?5 CMSTP
&#8226;        Based on 802.1S7 v+ e' B- X0 b# B' g6 B3 C+ j
&#8226;        Maps VLANs to instances  u/ d, H+ \" R( r1 L# f
PVST+
2 `8 D& Q- _0 z% d&#8226;        Based on IEEE 802.1D% d  p4 U- @3 ]3 ]# D
&#8226;        Default STP mode8 [  Q/ Z6 {* z3 L$ O
Rapid-PVST+  g; O; ?/ V" [
) Y, K9 b; y! _+ G  C4 [8 R( x&#8226;        Based on IEEE 802.1W  p* u! g# _( }) W& ]- \
& P- s! ~$ y3 H4 i&#8226;        Discarding port state
==========================================================+ k" p: r0 k$ I/ \8 H, H
# d! L0 p. g8 C4.        Forward / Hello / Hold
Forward; R. N, V; C  b5 F* L$ U- Z, e0 e
&#8226;        15 seconds& _- `! @; ]! L/ F( R
&#8226;        Listening or learning* J7 u4 \+ ~# X" l% s" H
Hello  Y8 ]8 [& [* T: T2 i
&#8226;        10 seconds5 \% K$ h, |% E' i/ P$ B- D! U
&#8226;        New BPDU
Hold- E. u6 {1 L; x2 A- F
& P; Y' y1 c% L% m0 o0 v&#8226;        20 seconds
! S, Z2 k( h. I* M1 Z$ {&#8226;        Time when BPDU expires
==========================================================' ]$ I( j8 e! K4 H3 X+ D( S/ _
, ?; h  M. i, o- m2 I7 u5.        Port Cost / Switch Port Priority / Switch Priority6 U9 Q" K- M5 Q0 h1 f3 W* v
Port Cost
&#8226;        8 default is being the interface value9 v3 Q5 D6 N' N9 ]! d- I& `4 q
&#8226;        Range 1 – 200k (200,000)' o2 \3 Q# Z+ f3 i* u
Switch Port Priority" ?/ U! k- A, e; l( ^" D
8 E* R# l1 Y' ]9 S, ^&#8226;        Default value is 128
&#8226;        Multiple of 16
, b- H5 O" D0 x* \8 ?. USwitch Priority+ Q: f% Y/ z$ K9 v7 b/ c* ]
&#8226;        Lower the better
/ ^% C) J, }6 |3 }4 R&#8226;        Multiple of 4096: b! x$ T* p! M  ?
! I) J' k. |; ^2 @2 F' u==========================================================
6.        Guard Loop / Guard Root
/ E: z# ~0 F7 o& WGuard Loop
) X/ Z% h6 S) [6 \' B9 u$ f- x( A8 g  ]&#8226;        Detecting unidirectional switching links% C6 A+ \6 V1 o+ `4 @
/ w3 M  t/ ]3 m; H&#8226;        Port self-recovery' a4 h. f3 y) h6 ^% L
Guard Root; C5 @4 F: o, v( f/ Q
$ R9 D) s5 z7 ]% y& v; C* J2 K0 f" [5 P&#8226;        A better BPDU disables the port as err-disabled
- c* D/ v2 C* \5 v0 X0 t0 ?) i&#8226;        Protect designated port from recei

byronyj

感謝樓主！

jeana

CCNP交换（300-115）考试新题汇总（5月24日更新）

llx

thanks