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[其他] 8.24部分錯誤(爭議)答案回報+GRE實作題提供

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发表于 2017-9-15 10:21:16 | 显示全部楼层 |阅读模式
8.24的題目,有部分錯誤(爭議)答案,回報給各位,可以相信或不相信,也很歡迎討論) C% l3 M3 F& h
※參考手中的另一份題庫、CCNA認證教戰手冊、自己的建立的觀念; @! _* }! q. b  i
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QUESTION 1736 ^0 i7 g; D8 z9 ]3 s( n( g
Which two features can dynamically assign IPv6 addresses? (Choose two.)
. D( @7 y+ y0 m! p. Y6 zA. IPv6 stateless autoconfiguration
) h9 W" f+ S5 e6 I, p2 DB. DHCP. t0 c7 H8 Y/ g. r3 |4 C3 O
C. NHRP
1 U3 _" p" C6 Z- x+ T$ m& I( ND. IPv6 stateful autoconfiguration; C+ }! t, Z9 l2 \/ `3 @- _% e; ]
E. ISATAP tunneling
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- g0 \  `, |' J+ y$ k1 y  g" z' ^* GCorrect Answer: AD$ K( E  I% u" W% j9 F/ C9 P
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另一份題庫答案是A、B,這部分我覺得要看怎麼解釋,DHCP服務有提供DHCPv6,但也是可以用DHCP表示,這題比較爭議,參考就好。  T' L" H; k0 s3 L9 a+ I
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QUESTION 96
3 m3 O: ?3 U1 l$ k' F: S8 b! f. `7 l  nWhich command can you enter to verify that a 128-bit address is live and responding?8 c% x2 [; A, R1 P; H( m9 r/ L
A. traceroute( K$ Y( K% B. @% n
B. telnet/ n7 M& B% B1 l; I) l* r1 z
C. ping
9 |$ \) R! \8 p5 |/ Z1 ^D. show ipv6
* w( y  i) B/ C% k& nCorrect Answer: C4 |/ M$ C% _- V0 Y+ Z$ e1 ^6 a6 u
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. n" H3 n, F+ ?. \+ X1 r# x這題另一份題庫D選項是ping ipv6,這樣的話答案會更加正確。! G' [# d  T7 f/ z0 g! c4 A
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QUESTION 426 M: c4 f5 J9 h3 m: Q
Which two statements about IPv4 multicast traffic are true? (Choose two.)( Y6 g+ [2 g9 W
A. It burdens the source host without affecting remote hosts.
6 V5 i7 e+ p6 NB. It uses a minimum amount of network bandwidth.
6 ?6 [# o, e4 m+ S7 @" jC. It is bandwidth-intensive.
; t3 K' r& `& u+ Q! j; WD. It simultaneously delivers multiple streams of data.- f# a. N1 N9 S/ d
E. It is the most efficient way to deliver data to multiple receivers.
: V$ Q4 L. F% {' }* kCorrect Answer: BE
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這題另一份題庫答案是DE,而我也認為DE比較正確。
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QUESTION 265
' X& t2 v& h! sRefer to the exhibit. Which statement describes the effect of this configuration?6 w' |3 O4 X' ^" m. e1 @
A. The VLAN 10 VTP configuration is displayed5 }. p6 Q3 i' ~2 L4 F5 X; ?- N6 ~
B. VLAN 10 spanning-tree output is displayed
9 `6 l4 w3 w) R7 B2 oC. The VLAN 10 configuration is saved when the router exits VLAN configuration mode9 S5 }2 a+ X% [" z& A! J7 I8 T1 a
D. VLAN 10 is added to the VLAN database
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Correct Answer: C& _+ ]- \/ ]/ I8 K
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這題有圖片的,我就不複製了。這題蠻確定答案應該是D,因為在未設定Vlan的情況下直接使用,會直接幫你建立,所以D應該是正解/ A: o: ]2 o; m) L; y4 |
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QUESTION 2573 u, F6 u3 M5 C. K' e+ l
Which RFC was created to alleviate the depletion of IPv4 public addresses?  w0 [; P, _. h/ R7 P/ c9 W: A
A. RFC 4193
. e( o' E3 e9 dB. RFC 1519* U0 v& k  R8 o. c1 h2 }
C. RFC 1518
! T5 a2 |2 ~- B! M8 G" kD. RFC 1918
( V4 F4 ~$ f4 i) k4 U, m- x( C. d: pCorrect Answer: D
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8 h& M8 ?* l! b5 ^& J: p這題答案蠻確定是錯的,減緩IPV4耗盡應該是透過CIDR與NAT來處理的,而CIDR是發佈在RFC1518、RFC1519裡面,我個人是偏向選C的選項的。而RFC1918裡面好像是寫到IP的5個calss分別吧@@+ {& e- f: `, ]) S% b
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# i$ s" b* O: v* L0 c1 cQUESTION 2864 M/ _4 y' j  e2 R
Which entity assigns IPv6 addresses to end users?
8 G' s. v7 ~: A$ x& R. qA. ICANN: W9 T% o- w$ h8 ~
B. APNIC% y9 |$ O( _/ k% T& u9 t& j( s; R2 Q
C. RIR7 E" T" x0 k# w- H9 G
D. ISPs% x+ g1 X& c2 q9 O2 b6 ]0 i' P
Correct Answer: D
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2 M9 [( j4 v( q8 o1 E這題網路上有部分的答案是給C,但我認為題目說到是end users,這部分我把它解釋成一般使用者的話,D選項的ISPs會更加合理。
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QUESTION 283- Z- i( P, j' x) e3 m: \6 @
Which value is indicated by the next hop in a routing table?
% V& p* R% E# |6 QA. preference of the route source
$ b8 f) I0 {7 ]5 gB. IP address of the remote router for forwarding the packets
& o9 [6 r2 L  S* l: ?2 F2 rC. how the route was learned) ^8 ?5 M) S( F) E6 b, O/ {
D. exit interface IP address for forwarding the packets
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% p* n& M% m+ B
Correct Answer: B4 P; Y; c/ Y! u
4 d! x7 W' t* b  s& `
這題其他題庫的答案是D,我也認同,因為路由表上是寫封包的下一個IP位置。- O# }6 w6 D- ?. m1 Y. V$ _

/ k  }! G/ @  r7 ^0 x( \QUESTION 310& ~* p$ ~% C. r' O3 R& P
How can you disable DTP on a switch port?8 ^( ~" O% Y9 v3 M; D* v
A. Configure the switch port as a trunk.  g  L2 `5 l4 P% Q* f$ M! H
B. Add an interface on the switch to a channel group.
' x$ Z6 O& }' b+ J; TC. Change the operational mode to static access
: Q; y9 C" u- m1 ?! M$ l) i/ eD. Change the administrative mode to access+ X1 F. k! c( `- P; v3 a) S- f
Correct Answer: D% h" i- _7 Q6 M2 v0 R+ f! _- `# Y
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這題答案應該是A,雖然很詭異,但在實作後更加確定,在mode是dynamic時的情況下,是無法關閉DTP的,只能先將設成trunk才可以關掉DTP。# [5 o2 S, N* d! {

* `2 T/ |/ q1 Y0 Z3 `/ SQUESTION 212
: ]6 Q, J8 ]- _. r6 P& q9 K# T6 GWhich Cisco platform can verify ACLs?
% z# H; E6 K5 f, r6 dA. Cisco Prime Infrastructure2 C' h% \, K( l, K
B. Cisco Wireless LAN Controller/ p# a; ~4 P+ g; r/ e
C. Cisco APIC-EM& R3 S" P- Z; u6 W5 M
D. Cisco IOS-XE
" R$ N: r3 {8 y9 P8 n+ uCorrect Answer: C8 S3 q2 ^1 K1 L# `* K, K4 {
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% f" ^' K2 N; @: s8 z; P6 ?7 A這題答案應該是B,因為cisco的無線網路控制器是支援ACL的。1 @8 N2 U% L, o+ J# F" y/ K

! R! v; C( m( T& g/ V) B. T2 \QUESTION 141
0 z9 G% C/ l  L# t0 V9 |Which component of the Cisco SDN solution serves as the centralized management system?% y7 G. k7 ?* W# k  q
A. Cisco OpenDaylight
: C# p, t7 ^6 C8 ^2 i; l, R) R6 JB. Cisco ACI& i+ z9 C+ Q8 ?, X: z
C. Cisco APIC: S7 x; I! R! [) c
D. Cisco IWAN
% o9 |' G& K- M- z. ~3 {Correct Answer: C
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這題別的題庫的答案是B,我也不確定,附上原文解釋各位自行參考。
/ K' v7 ^4 V# Z# BExplanation:   3 N4 e; }* c2 L4 T9 R6 D! j
Cisco ACI is a comprehensive SDN architecture. This policy-based automation solution supports a 4 u  e& _* T% w2 O
business-relevant application policy language, greater scalability through a distributed enforcement
; ?4 P9 h. ~/ L$ R! j& tsystem, and greater network visibility. These benefits are achieved through the integration of physical and
( b- Y. K4 Z; F/ U2 K; ^$ ]virtual environments under one policy model for networks, servers, storage, services, and security.
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8 R  c! `" ?4 q( b) p' d! \----------以上題目歡迎討論,也可以提出其他不確定的題目來討論-------------
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2 r+ B( }  |1 @5 B* {3 ]* H$ F---------以下提供GRE完整的實作題給大家參考----------
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拓樸

拓樸

4 b% W6 K; T" q% R* r2 m# H8 U- Q大家的圖應該都是長得差不多,但題目和設定值會不一定,請務必注意!!!!!!2 h$ Z: K  D" Z

# k, ^7 z+ J2 q! L% ]Q1.Why did Branch1 router lose WAN connectivity with R1 router? ) C6 S* K) z0 z# O% C1 |4 Q2 O; g! X
A. The IP address is misconfigured on PPP multilink interface on the Branch1 router.
0 W& v& v, |# N+ ?B. The PPP multilink group is misconfigured on the £ranch1 serial interfaces. 3 z0 _* x0 V' u. v1 F# Y2 i1 N' ^
C. The PPP multilink group is misconfigured on the R1 serial interfaces. # }: f/ E6 z6 ~* J+ n
D. The Branch1 serial interfaces are placed in a shutdown condition. . W2 ?4 Q, N! r
Answer: A
# \" U2 |! e! q: H; \- }8 @( Y- z' W/ |- k5 Y5 \

7 `$ D4 l! x, Q6 w8 `Q2.Why is the Branch2 network 10.1 0.20.0/24 unable to communicate with the Server farm1 network 10.1
% g9 {* N4 r, x0.10.0/24 over the GRE tunnel? 2 ?% i1 R6 s- g* L  \: w$ \; r
A. The GRE tunnel destination is not configured on the R2 router.
- d8 H# T* H" U. `- v9 v7 {6 m5 bB. The GRE tunnel destination is not configured on the Branch2 router. ; u: K: s6 _6 i
C. The static route points to the tunnel0 interface that is misconfigured on the Branch2 router. & g- i6 J3 |8 X. Q0 z% o# B' f
D. The static route points to the tunnel0 interface that is misconfigured on the R2 router. ) \5 P5 @, i7 i; {: ?
Answer: C
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Q3.Why has the Branch3 router lost connectivity with R1? Use only show commands to troubleshoot
6 ~& L+ O/ B) t* p! \! Ubecause usage of the debug command is restricted on the Branch3 and R1 routers. - T1 C7 I8 O3 T$ l
A. A PPP chap hostname mismatch is noticed between Branch3 and R1.
$ t4 d1 ~( x& h* b+ vB. A PPP chap password mismatch is noticed between Branch3 and R1. 2 v: E0 i9 N/ j+ A9 i" [
C. PPP encapsulation is not configured on Branch3.
2 S! c" n9 p" S3 c8 k* C& X2 _D. The PPP chap hostname and PPP chap password commands are missing on the Branch3 router. " l$ T0 r6 B# B' W% ~9 K1 j
Answer: A
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+ n0 E0 F6 H* H9 NQ4.Which statement about the router configurations is correct?
1 D1 _: A4 @: d' K" t! YA. PPP PAP is authentication configured between Branch2 and R1. ! |$ C- c' Q5 G$ m
B. Tunnel keepalives are not configured for the tunnel0 interface on Branch2 and R2.
0 w9 E# Q; g* }5 VC. The Branch2 LAN network 192.168.11 0/24 is not advertised into the EIGRP network. / Q, Y9 e. {+ y) `) S8 O8 [0 C
D. The Branch3 LAW network 192.168.10.0/24 is not advertised into the EIGRP network. 0 y  O$ M( Z" N9 Z1 w& r
E. PPP CHAP is authentication configured between Branch1 and R1.
3 W* a% E, S# N% l/ jAnswer: D
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发表于 2017-9-15 10:24:11 | 显示全部楼层
我頂  推討論
沙发 2017-9-15 10:24:11 回复 收起回复
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发表于 2017-9-15 10:56:12 | 显示全部楼层
板凳 2017-9-15 10:56:12 回复 收起回复
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发表于 2017-9-15 10:57:47 | 显示全部楼层
謝謝你 的分享
地板 2017-9-15 10:57:47 回复 收起回复
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发表于 2017-9-15 11:12:46 | 显示全部楼层
谢谢分享
5# 2017-9-15 11:12:46 回复 收起回复
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发表于 2017-9-15 11:29:14 | 显示全部楼层
感谢楼主分享!
6# 2017-9-15 11:29:14 回复 收起回复
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发表于 2017-9-15 11:42:22 | 显示全部楼层
谢谢分享
7# 2017-9-15 11:42:22 回复 收起回复
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发表于 2017-9-15 14:11:01 | 显示全部楼层
谢谢分享
8# 2017-9-15 14:11:01 回复 收起回复
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发表于 2017-9-15 15:23:25 | 显示全部楼层
9# 2017-9-15 15:23:25 回复 收起回复
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发表于 2017-9-15 21:37:19 | 显示全部楼层
QUESTION 173: Which two features can dynamically assign IPv6 addresses? (Choose two.)
! R$ L4 |. g. X- p============================
" _+ m- K, g3 V 这一题有什么争议? 肯定是 A. IPv6 stateless autoconfiguration 和 B. DHCP 啊!你可以查看CISCO 官网关于IPv6的说明 (slaac是Stateless address autoconfiguration,无状态地址自动配置。 )' J1 g6 o9 q# w7 Q- x! Q+ V
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Untitled.jpg
10# 2017-9-15 21:37:19 回复 收起回复
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发表于 2017-9-15 22:36:22 | 显示全部楼层
QUESTION 96, D选项是 show ipv6, 不是ping ipv6;1 u( `. \5 _0 [3 Y# C9 c9 i

9 _: Q. H- G" g3 F( H7 YQUESTION 42, CISCO官网的定义:IP multicast is a bandwidth-conserving technology that reduces traffic by simultaneously delivering a single stream of information to potentially thousands of corporate recipients and homes. D选项是“multiple streams of data”。: A; L- o+ H8 P3 {8 Y+ u
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QUESTION 265, 我也觉得答案是D啊。% c  y0 L, E6 q; R6 j" x5 O

% {, z: _" |4 H3 P" [QUESTION 257, RFC 1918 was used to create the standards by which networking equipment assigns IP addresses in a private network. A private network can use a single public IP address. 这样一来企业内部的主机就可以使用私有地址,不需要给每个主机一个由Internet注册机构分配的全局唯一的地址空间,从而节省了IPv4 public addresses. 我觉得答案是D。0 e7 \, n" E) U4 w
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11# 2017-9-15 22:36:22 回复 收起回复
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发表于 2017-9-16 07:41:32 | 显示全部楼层
Thank you for sharing!
12# 2017-9-16 07:41:32 回复 收起回复
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 楼主| 发表于 2017-9-18 09:08:47 | 显示全部楼层
Fr0nky 发表于 2017-9-15 22:36
8 P) Z- a1 c1 v+ l7 d$ m0 _QUESTION 96, D选项是 show ipv6, 不是ping ipv6;
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, |$ T" h+ _% f7 n9 b; oQUESTION 42, CISCO官网的定义:IP multicast is a b ...
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Q96:我在其他題目看到的D選項是ping ipv6,而答案也是ping ipv6比較合理,所以我是表示這題有可能答案有錯,ping ipv6比較合適
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Q42:這題我也不確定,但你提供出資料了,我認同你的答案
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Q257:這題我就....不知道怎解釋了,我是認為緩解ipv4耗盡的手法是因為NAT和CIDR的技術來處理的,而NAT是把私有地址轉實體地址,CIDR可以把本來被遮罩浪費掉的IP有效利用。至於私有地址是不是正解這點我覺得就沒有個答案,可能要有更詳細的解釋才比較好釐清了
13# 2017-9-18 09:08:47 回复 收起回复
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发表于 2017-9-18 19:52:12 | 显示全部楼层
QUESTION 257 我查了别的网站的CCNA题库, 基本都是选RFC 1918
14# 2017-9-18 19:52:12 回复 收起回复
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发表于 2017-9-18 20:06:39 | 显示全部楼层
QUESTION 286, 赞同你的观点,选ISPs  @) p9 A$ x/ x
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Q283, 我觉得答案是B
; i$ L! o) f/ d' e: M( z; Q参看这个链接* N6 O7 K1 T9 i0 q' M
The routing table consists of at least three information fields: 1. the network id: i.e. the destination subnet; 2. cost/metric: i.e. the cost or metric of the path through which the packet is to be sent; 3. next hop: The next hop, or gateway, is the address of the next station to which the packet is to be sent on the way to its final destination.
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: k" N* p, m3 F  \The next hop is a routing term that refers to the next closest router a packet can go through. The next hop is among the series of routers that are connected together in a network and is the next possible destination for a data packet.
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Example of static route:' e7 i5 b$ J  J4 N' |5 Q& B
using the next hop IP:
4 v$ w- E1 m9 k5 @ ip route 0.0.0.0 0.0.0.0 192.16.1.1& P* D7 H2 v4 f( M6 R" S" K
Pointing to the interface:
9 Y1 Y) T- }. n6 w. A7 [. O) T ip route 0.0.0.0 0.0.0.0 Serial0/0# [( U( U$ g% S8 Y! ^
; u; ^# ~$ Q) v) I
Route source: Identifies how the route was learned.8 Z/ c0 D5 Q9 v) V. A' D
Destination network: Identifies the address of the remote network.
. c8 W, [/ o# t" j3 ] Administrative distance: Identifies the trustworthiness of the route source.# |2 {0 P: w/ n
Metric: Identifies the value assigned to reach the remote network. Lower values indicate preferred routes.& E2 f! a! I+ u7 b/ P
Next hop: Identifies the IPv4 address of the next router to forward the packet to.
  ?" C' R1 F& d  j4 z+ z* t Route timestamp: Identifies from when the route was last heard.
5 s, b, U1 d3 m2 u( @2 y Outgoing interface: Identifies the exit interface to use to forward a packet toward the final destination.
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15# 2017-9-18 20:06:39 回复 收起回复
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