8.24部分錯誤(爭議)答案回報+GRE實作題提供

david99022

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
& U! y: u  [+ p) J9 k, w' [' {※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

QUESTION 173
6 P* v; j7 c# PWhich two features can dynamically assign IPv6 addresses? (Choose two.)
A. IPv6 stateless autoconfiguration
* F; Z' q' G# z2 A0 XB. DHCP
1 J  n# Z) d7 U: ^/ Q1 KC. NHRP
D. IPv6 stateful autoconfiguration
E. ISATAP tunneling
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Correct Answer: AD
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5 S0 E# @6 Y; x8 k9 U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。
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! c/ E9 y& P1 O& ~4 @, TQUESTION 96
% ~0 ]7 z5 t# J2 a2 r/ oWhich command can you enter to verify that a 128-bit address is live and responding?
A. traceroute
- p. Z- j: t% P; e$ Z- `' _. \B. telnet
C. ping
* w$ R' g1 H8 n3 b1 P/ n, n4 T- JD. show ipv6
Correct Answer: C
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3 g2 ?* v* S" p3 c" O$ J$ l" I. m這題另一份題庫D選項是ping ipv6，這樣的話答案會更加正確。
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QUESTION 42
2 v6 `* e4 I8 P0 ~/ tWhich two statements about IPv4 multicast traffic are true? (Choose two.)
; _1 l9 P+ v  u6 W& B! J( IA. It burdens the source host without affecting remote hosts.
B. It uses a minimum amount of network bandwidth.
C. It is bandwidth-intensive.
+ }! d6 B1 t" i$ {( p: PD. It simultaneously delivers multiple streams of data.
E. It is the most efficient way to deliver data to multiple receivers.
1 Z( @+ J& c, z" d- `* P3 OCorrect Answer: BE


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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" J) D/ M3 T' U2 ?1 I0 M: m/ YQUESTION 265
Refer to the exhibit. Which statement describes the effect of this configuration?
# Z7 _9 Y* A, g, F( A6 yA. The VLAN 10 VTP configuration is displayed
B. VLAN 10 spanning-tree output is displayed
% w1 m. C: _" }5 m! S0 e8 {5 e$ }C. The VLAN 10 configuration is saved when the router exits VLAN configuration mode
) \% A! G5 C, T# h2 r' R! rD. VLAN 10 is added to the VLAN database
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Correct Answer: C
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; c! ?5 V5 b8 Z/ \8 x( F9 y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
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QUESTION 257
2 n$ u6 `" }1 c9 X& j8 f% b5 i/ ?Which RFC was created to alleviate the depletion of IPv4 public addresses?
A. RFC 4193
B. RFC 1519
C. RFC 1518
  S3 W+ P2 G: j. kD. RFC 1918
Correct Answer: D
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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@@


QUESTION 286
1 m; c& d$ D8 X# G& xWhich entity assigns IPv6 addresses to end users?
A. ICANN
( C6 v4 L  g9 KB. APNIC
8 |) `* ~# j# w& [* @C. RIR
: k( y/ V! d% N/ D; n& SD. ISPs
# y3 }* M/ `+ `Correct Answer: D
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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。

" w- ?0 J$ p. SQUESTION 283
Which value is indicated by the next hop in a routing table?
A. preference of the route source
B. IP address of the remote router for forwarding the packets
C. how the route was learned
7 L0 `6 k7 W3 `& p# jD. exit interface IP address for forwarding the packets
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Correct Answer: B
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8 d8 i+ R( I# X) ?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。
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QUESTION 310
" F" U/ V, D7 }5 V" L% [% Y. G8 s4 UHow can you disable DTP on a switch port?
% H3 F3 s" x' ZA. Configure the switch port as a trunk.
0 J+ U  M' ]: L7 ^- R% ZB. Add an interface on the switch to a channel group.
C. Change the operational mode to static access
2 B6 I% z. Y1 G: F! H" N4 P8 z) P2 WD. Change the administrative mode to access
' q1 G$ y# u( CCorrect Answer: D


3 c+ v4 u! L1 R  Y/ s" h6 u' l8 d9 W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。
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QUESTION 212
Which Cisco platform can verify ACLs?
( K1 e) U9 j0 cA. Cisco Prime Infrastructure
4 q  i+ y' m) s5 {/ TB. Cisco Wireless LAN Controller
' O2 {+ ?4 B& {/ e# hC. Cisco APIC-EM
. \9 Z" q- q" d+ G& f3 AD. Cisco IOS-XE
/ W7 Y* b9 v( ~! H* tCorrect Answer: C

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這題答案應該是B，因為cisco的無線網路控制器是支援ACL的。
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QUESTION 141
3 c4 d8 N, _' u5 k/ p1 TWhich component of the Cisco SDN solution serves as the centralized management system?
A. Cisco OpenDaylight
/ J: U' E% [$ w+ x( Q  TB. Cisco ACI
( ^9 `) R7 ]1 ~7 KC. Cisco APIC
D. Cisco IWAN
Correct Answer: C

9 l0 u5 q2 D3 W& C2 z3 u  B! D
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。
/ m$ L1 K& I) f! CExplanation:   
( H, i' t+ j2 w% z+ [! o5 i+ \/ g4 oCisco ACI is a comprehensive SDN architecture. This policy-based automation solution supports a
business-relevant application policy language, greater scalability through a distributed enforcement
system, and greater network visibility. These benefits are achieved through the integration of physical and
% w  k" N! E( M* I  Evirtual environments under one policy model for networks, servers, storage, services, and security.
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----------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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1 Y7 U& a. e8 B+ Q$ N; g' N---------以下提供GRE完整的實作題給大家參考----------
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拓樸

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!!!!!!
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4 B" T% q# U( E2 T  GQ1.Why did Branch1 router lose WAN connectivity with R1 router?
, R0 K, c& H8 f3 UA. The IP address is misconfigured on PPP multilink interface on the Branch1 router.
B. The PPP multilink group is misconfigured on the ￡ranch1 serial interfaces.
1 J' {9 `' p7 k# [. }0 d6 PC. The PPP multilink group is misconfigured on the R1 serial interfaces.
D. The Branch1 serial interfaces are placed in a shutdown condition.
- `( U( k- {' J/ C. Y4 GAnswer: A


Q2.Why is the Branch2 network 10.1 0.20.0/24 unable to communicate with the Server farm1 network 10.1
5 {, [! I+ x+ R% d5 \6 O0.10.0/24 over the GRE tunnel?
A. The GRE tunnel destination is not configured on the R2 router.
/ o5 s$ z" Q5 g, _- b% Z" r4 \B. The GRE tunnel destination is not configured on the Branch2 router.
C. The static route points to the tunnel0 interface that is misconfigured on the Branch2 router.
D. The static route points to the tunnel0 interface that is misconfigured on the R2 router.
Answer: C


Q3.Why has the Branch3 router lost connectivity with R1? Use only show commands to troubleshoot
" v; H" c( ]4 R, `! Hbecause usage of the debug command is restricted on the Branch3 and R1 routers.
A. A PPP chap hostname mismatch is noticed between Branch3 and R1.
B. A PPP chap password mismatch is noticed between Branch3 and R1.
' ?( @$ V) S( }C. PPP encapsulation is not configured on Branch3.
D. The PPP chap hostname and PPP chap password commands are missing on the Branch3 router.
Answer: A


6 h  J2 O$ P! n! n7 D% i. @Q4.Which statement about the router configurations is correct?
, t$ d6 D8 E% kA. PPP PAP is authentication configured between Branch2 and R1.
: _" N9 Z; D" H! l7 @6 tB. Tunnel keepalives are not configured for the tunnel0 interface on Branch2 and R2.
C. The Branch2 LAN network 192.168.11 0/24 is not advertised into the EIGRP network.
/ k: `+ K$ c" h8 y' f+ GD. The Branch3 LAW network 192.168.10.0/24 is not advertised into the EIGRP network.
, I3 _/ }) Q  r% P$ ?E. PPP CHAP is authentication configured between Branch1 and R1.
( u3 ]& M6 N- N7 z2 g6 I; EAnswer: D

kuokevin

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大碧池

Orion.kwan

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广州华尔思

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Rockyw

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naixer

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808

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jackyman05

Fr0nky

QUESTION 173: Which two features can dynamically assign IPv6 addresses? (Choose two.)
( I  {9 o+ N, i" W% c============================
9 `& ^1 h: u: L7 m; W  u 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。 ）
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Fr0nky

QUESTION 96, D选项是 show ipv6， 不是ping ipv6;
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5 T6 m. k2 Y5 m: mQUESTION 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”。
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+ x1 t. R! P. AQUESTION 265， 我也觉得答案是D啊。
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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。
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wyang9311

Thank you for sharing!

david99022

Fr0nky 发表于 2017-9-15 22:36
QUESTION 96, D选项是 show ipv6， 不是ping ipv6;
" `  E9 t) f1 A* d: n) z& ^1 f
$ H0 c1 g- A; m2 T- ^8 ^# r$ T! cQUESTION 42, CISCO官网的定义：IP multicast is a b ...

9 t! T7 {* ^' h- ?; m9 X0 NQ96: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

" c6 V  c3 J' M$ \0 tQ42:這題我也不確定，但你提供出資料了，我認同你的答案

2 c5 ]  ^" ?/ a. oQ257: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

Fr0nky

QUESTION 257 我查了别的网站的CCNA题库， 基本都是选RFC 1918

Fr0nky

QUESTION 286， 赞同你的观点，选ISPs

Q283, 我觉得答案是B
参看这个链接
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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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.

( `) O" k- o( z* L  _7 ZExample of static route:
, W0 J- u, m* f: C4 ~' j6 O using the next hop IP:
ip route 0.0.0.0 0.0.0.0 192.16.1.1
  o3 e* g  Y8 v4 ]  z2 X' F) z Pointing to the interface:
8 B6 L2 d( z2 X, N ip route 0.0.0.0 0.0.0.0 Serial0/0

" I* ]# l) A8 \$ x$ f+ MRoute source: Identifies how the route was learned.
; m8 j1 w3 c/ t( N: O Destination network: Identifies the address of the remote network.
0 E2 }" Y# q2 w& i Administrative distance: Identifies the trustworthiness of the route source.
" A2 Z% |. b3 E2 O4 R, x8 c: v Metric: Identifies the value assigned to reach the remote network. Lower values indicate preferred routes.
Next hop: Identifies the IPv4 address of the next router to forward the packet to.
Route timestamp: Identifies from when the route was last heard.
1 v8 \( B$ |: b8 d Outgoing interface: Identifies the exit interface to use to forward a packet toward the final destination.
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