QUESTION NO: 67
The TestKing frame relay network is shown below:
In this network, which statement describes DLCI 17?
网络拓扑如下,对于DLCI17说法正确的是?


A. DLCI 17 is the Layer 2 address used by TK2 to describe a PVC to TK3.
B. DLCI 17 describes the ISDN circuit between TK2 and TK3.
C. DLCI 17 describes a PVC on TK2. It cannot be used on TK3 or TK1.
D. DLCI 17 describes the dial-up circuit from TK2 and TK3 to the service provider.

解析:帧中继上的DLCI是代表PVC链路的,每条PVC链路的DLCI值本地有效.
对TK2来说,17号链路通向TK3,反之,对TK3来说,128号链路通向TK2

Answer: A

QUESTION NO: 68 DRAG DROP
Drag each EIGRP term or concept on the left to its appropriate description on the
right. Note: Not all options are used.
拖拽题目,选择EIGRP的相关概念.


解析:
可行后继是备份路由,所有FC都在拓扑表中.

QUESTION NO: 69
Which statement about RIP routing is true?
有关RIP路由协议,下列说法正确的是?

A. If RIP version 2 is used, the subnet mask is sent to neighboring RIP routers.
B. The no ip classless command enables classful RIP routing.
C. Subnetting is not supported if RIP is being used.
D. Classless routing is the default method used by RIP on a router.

解析:
A.使用RIP v2版,子网掩码会同时发送给邻居
B.指令no ip classless可以启动有类路由
C.RIP不支持子网
D.无类路由是RIP缺省配置
RIP v2有许多好处,第一个就是支持无类路由.

答案:A
Answer: A

QUESTION NO: 70
Refer to the exhibit below:
In this frame relay network, which IP addresses would be assigned to the interfaces
with point-to-point PVCs?
看图说话：使用点对点模式PVC的接口应该设置那个IP地址？


A. DLCI 16: 192.168.10.1 /24
DLCI 17: 192.168.10.1 /24
DLCI 99: 192.168.10.2 /24
DLCI 28: 192.168.10.3 /24

B. DLCI 16: 192.168.10.1 /24
DLCI 17: 192.168.11.1 /24
DLCI 99: 192.168.12.1 /24
DLCI 28: 192.168.13.1 /24

C. DLCI 16: 192.168.10.1 /24
DLCI 17: 192.168.10.2 /24
DLCI 99: 192.168.10.3 /24
DLCI 28: 192.168.10.4 /24

D. DLCI 16: 192.168.10.1 /24
DLCI 17: 192.168.11.1 /24
DLCI 99: 192.168.10.2 /24
DLCI 28: 192.168.11.2 /24

解析：可以看到，上面的路由器TK2需要一条链路连接两个路由器，说明该接口必须用了子接口。
也就是说，DLCI16和DLCI99同一网段，DLCI17和DLCI28同一网段,分析答案中只有D合适。
答案：D

谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢谢

要是一下子发出来就好了，看的有点累！～～

QUESTION NO: 71
Exhibit:
Please study the exhibit carefully. Given the partial output from the show
running-config command displayed on both routers, which routing protocol would
be used to route packets to the 172.16.5.48/28 network from RouterB?

仔细看图,两个路由器配置如下.

来自路由器RouterB,去往172.16.5.48/28网络的数据包应该被哪个路由协议路由?


A. OSPF
B. RIP
C. EIGRP
D. No route will be installed to 172.16.5.48/28.

解析:172.16.5.48/28在路由器A的左面,从配置中可以看到既然EIGRP开启了自动归纳,
那么这个网段会被归纳成172.16.0.0/16,两个路由器对这个网段会不知所踪
而OSPF就没有这个问题,可以实现对该网段的路由.

答案:A

QUESTION NO: 72
Which characteristics are representative of link-state routing protocols? (Choose three)
链路状态路由协议有哪些特点(3选)?

A. Provides common view of entire topology
B. Utilizes event-triggered updates
C. Exchanges routing tables with neighbors
D. Calculates shortest path
E. Utilizes frequent periodic updates

解析:
A.对拥有整个网络拓扑
B.触发更新
C.和邻居交换路由表 ->错误,RIP才这样
D.计算最短路径
E.周期性更新 ->错误,触发更新

答案:A,B,D

QUESTION NO: 73
What are two reasons why the TestKing network administrator would use CDP in a network? (Choose two)
网管使用CDP协议主要干什么(2选)?
A. To obtain the IP address of a connected device in order to telnet to the device
B. To determine the status of the routing protocols between directly connected routers
C. To obtain VLAN information from directly connected switches
D. To determine the status of network services on a remote device
E. To verify Layer 2 connectivity between two devices when Layer 3 fails
F. To verify the type of cable interconnecting two devices
解析:CDP协议是思科专用协议,用来发现邻居的思科设备有关信息,看一个问问题的例子
Router#show cdp neighbors
Capability Codes: R - Router, T - Trans Bridge, B - Source Route Bridge
S - Switch, H - Host, I - IGMP, r - Repeater
Device ID Local Intrfce Holdtme Capability Platform Port ID
13ceng2950 Eth 1/0 147 S I WS-C2950-2Fas 0/1
switch Fas 0/0 159 S I WS-C2950G-Fas 0/48
Eth 1/0 127 R S I Cisco 2811Fas 0/0
Router Eth 1/0 122 R 2500 Eth 0
Router Eth 1/0 147 R 2611XM Fas 0/0
Router Eth 1/0 135 R Cat4232L3 Fas 1
hd-internet Eth 1/0 137 S I WS-C2950-2Fas 0/1
PBJ-Router Eth 1/0 172 R 1720 Eth 0
Eth 1/0 131 R S I Cisco 2811Fas 0/0
RongBao Eth 1/0 124 R 2621 Fas 0/0
解析:可以看出直连设备互相之间交换的CDP包中的内容主要包括：对端设备的名称、对端设备的性能（如交换机还是路由器）、对端设备的平台（型号）、对端设备的IP地址（或管理IP）等信息。
答案:A,E

QUESTION NO: 74
Which three statements are true about RIP? (Choose three.)
有关RIP协议，下列说法正确是哪三个？

A. RIPv1 does not support routing update authentication. RIPv2 does support routing update authentication.
B. RIPv1 does not support advertising routes across WANs. RIPv2 supports advertising routes across LANs as well as WANs.
C. RIPv1 does not include subnet information in routing updates. RIPv2 does include subnet information in routing updates.
D. RIPv1 sends periodic routing updates over the multicast IP address 224.0.0.10. RIPv2 sends periodic routing updates over the multicast IP address 224.0.0.9.
E. RIPv1 does not support a network addressing scheme in which hosts within the same major network have different subnet masks. RIPv2 does allow hosts within the same major network to have different subnet masks.
F. RIPv1 uses hold-down timers and split horizon to prevent routing loops. RIPv2 does not require hold-down timers or split horizon to prevent routing loops.

解析：本题其实是考察RIP两个版本的异同
RIPv1发送路由更新，不携带子网掩码；而RIPv2携带每个路由条目的子网掩码。
RIPv1广播发送路由更新，广播地址为255.255.255.255；RIPv2组播发送路由更新，组播地址为224.0.0.9。
RIPv2路由选择更新具有认证功能。
RIPv2每个路由更新条目都携带下一跳地址。
RIPv2的更新包中包含外部路由标记。
RIPv1是有类路由协议，而RIPv2是无类路由协议。RIPv1 不支持不连续的子网，而RIPv2支持。

答案：A, C, E

QUESTION NO: 75
Which of the following are key characteristics of PPP? (Choose three.)
下列哪些是PPP的关键特点?

A. Provides error correction
B. Maps Layer 2 to Layer 3 address
C. Encapsulates several routed protocols
D. Can be used over analog circuits
E. Supports IP only

解析：PPP相对以前的SLIP有如下特点或者说新功能
1，PPP帧中增加了校验字段，因而PPP在链路层上具有差错检测的功能。
2，PPP的LCP协议提供了通信双方进行参数协商的手段。
3，PPP中增加了协议字段，并已提供了一组NCP，使得PPP可以支持多种网络协议
4，支持IP的NCP可以在建立连接时动态分配IP地址。
5，PPP支持多条线路的绑定

答案：A，C，D

QUESTION NO: 76
What can be determined from the line of show ip route output shown in the exhibit?(Choose two)
从show ip route的输出可以得到什么结论(2选)？



A. The 10.10.10.8 network is two hops away from this router.
B. The next routing update can be expected in 35 seconds.
C. The IP address 10.10.10.6 is configured on S0/1.
D. The IP address 10.10.10.8 is configured on S0/1.
E. This route is using the default administrative distance.

解析：输出的意思是：去往10.10.10.8网络的数据包下一站应该是10.10.10.6.管理距离120，度量值为2跳。
S0/1是本机端口，该路由是从这个端口上学到的，该端口并不是下一跳端口。

答案：A,E

QUESTION NO: 77
RIP debugging was enabled on a TestKing router as shown below:
Based on this info, which route will be found in the routing table of the Main router?
路由器启用了RIP debug，从输出中分析，哪条路由会出现在Main路由器中？



A. C 192.168.2.0 is directly connected, Serial0/1
B. R 192.168.255.16 [120/2] via 192.168.255.21, 00:00:22, Serial0/0
C. R 192.168.2.0/24 [120/1] via 192.168.255.26, 00:00:24, Serial0/1
D. R 192.168.255.16 [120/1] via 192.168.255.26, 00:00:24, Serial0/1

解析：首先从S0/0上接到了两条路由:2跳的192.168.2.0和1跳的192.168.255.16
然后从S0/1上接到了1跳的192.168.2.0和1跳的192.168.255.16
通过对度量值的对比，从S0/1上接到的192.168.2.0(跳数小)进入路由表
因为从2个接口上得到的192.168.255.16跳数相同，所以保留第一个就可以了。

Answer: C

Section 5: Evaluate the TCP/IP communication process and its associated protocols (33 questions)
第5部分：TCP/IP通信过程和相关协议

QUESTION NO: 1
Which of the protocols below use TCP at the transport layer? (Select four)
哪些协议在传输层上使用TCP协议？（4选）

A. TFTP
B. SMTP
C. SNMP
D. FTP
E. HTTP
F. HTTPS

解析：使用UDP的有TFTP,SNMP，其他都是用TCP的。

Answer: B, D, E, F

QUESTION NO: 2
Which of the following protocols utilize UDP as the layer 4 transport mechanism? (Choose all that apply)
在3层传输方式上使用UDP的协议是？

A. TACACS
B. Telnet
C. SMTP
D. SNMP
E. HTTP
F. TFTP

解析：同上题

Answer: D, F

QUESTION NO: 3
Which one of the following protocols uses both UDP and TCP ports for the transport layer operation?
在传输层上同时使用TCP和UDP的协议是哪个？

A. FTP
B. TFTP
C. SMTP
D. Telnet
E. DNS

解析：Only DNS uses both UDP and TCP port 53.
Answer: E

QUESTION NO: 4
Which of the following protocols utilize TCP? (Choose all that apply)
哪些协议使用TCP?

A. NTP
B. NNTP
C. SMTP
D. SNMP
E. HTTPS
F. TFTP

解析：
B. NNTP uses TCP port 119
C. SMTP uses TCP port 25
E. HTTPS uses TCP port 443
A. NTP uses UDP port 123
D. SNMP uses UDP port 161
F. TFTP uses UDP port 69

Answer: B, C, E

QUESTION NO: 5
Although TCP segments differ from UDP segments, they both contain some
common fields. What two segments do they share in common? (Select two answer choices)
虽然TCP报文和UDP有所不同，但依然有些相同之处，请指出2个？

A. Source address
B. Options
C. Sequence number
D. Sources
E. Destination port
F. Checksum

解析：相信源端口字段和目标端口字段肯定要有，校验字段也是必须的。

答案：E,F

QUESTION NO: 6
The corporate head office of TestKing has a teleconferencing system that uses VOIP (voice over IP) technology.

This system uses UDP as the transport for the data transmissions. If these UDP datagrams arrive at their

destination out of sequence,what will happen?
企业使用了VOIP技术实现通话，系统采用UDP传输协议，如果UDP报文到达时候报文排列顺序不对应该怎么办？

A. UDP will send an ICMP Information Request to the source host.
B. UDP will pass the information in the datagrams up to the next OSI layer in the order
that they arrive.
C. UDP will drop the datagrams.
D. UDP will use the sequence numbers in the datagram headers to reassemble the data in
the correct order.
E. UDP will not acknowledge the datagrams and wait for a retransmission of the
datagrams.

解析：UDP不是面向连接的协议，发现数据无法正常接收便会交给上层处理。

答案：B

QUESTION NO: 7
A legacy network that is prone to errors may have issues with services that use
UDP. Which of the following services could have problems in this case, due to the
fact that UDP is used? (Select three answer choices.)

某老旧网络使用UDP协议，但时常出问题，哪些协议会受此影响(3选)?

A. DNS
B. Telnet
C. SMTP
D. SNMP
E. HTTP
F. TFTP

解析:还是考查使用UDP的协议
A. DNS uses both UDP and TCP (port 53)
D. SNMP uses UDP port 161
F. TFTP uses UDP port 69
B. Telnet uses TCP port 23
C. SMTP uses TCP port 25
E. HTTP uses TCP port 80

答案：D,F,C