最新CCNA考题1.Which of the following are true concerning distance vector and link state routing protocols? (Choose 2.)
A. Distance vector protocols send the entire routing table to directly connected neighbors.
B. Link state protocols send the entire routing table to all routers in the network.
C. Distance vector protocols send updates about directly connected neighbors to all networks listed in the routing table.
D. Link state protocols send updates containing the state of their own links to all other routers on the network.
Answer:AD
最新CCNA考题2.Given a subnet mask of 255.255.255.224, which of the following addresses can be assigned to network hosts? (Choose three.)
A. 15.234.118.63
B. 92.11.178.93
C. 134.178.18.56
D. 192.168.16.87
E. 201.45.116.159
F. 217.63.12.192
Answer:BCD
解释： 224 11100000 3位表示网络， 5位代表主机
A. 15.234.118.63 63 二进制为： 111111 为广播地址
B. 92.11.178.93 93 二进制为： 1011101 可以使用
C. 134.178.18.56 56 二进制为： 111000 可以使用
D. 192.168.16.87 87 二进制为： 1010111 可以使用
E. 201.45.116.159 159 二进制为：10011111 为广播地址
F. 217.63.12.192 192 二进制为：11000000 代表网络
最新CCNA考题3.Refer to the graphic.
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The network administrator suspects that the link is overloaded. Based on the partial output of the
Router# show frame relay pvc
command shown in the graphic, which output value indicates to the local router that traffic sent to the corporate site is experiencing congestion?
A. DLCI=100
B. last time PVC status changed 00:25:40
C. in BECN packets 192
D. in FECN packets 147
E. in DE packets 0
Answer:C
解释：
BECN为后向拥塞指示：
FECN为前向拥塞指示：
BECN是向数据传输方向的源方发送的（方向与数据传输方向相反），
而FECN是向数据传输方向的目的方发送的（方向与数据传输方向相同）
此处in BECN packets 192，表示本地路由器发送数据到总部网络时发生拥塞，
它收到BECN后，将会降低发送速率，从而导致速率下降。
选择选择 C
最新CCNA考题5.
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Upon reviewing the command output of both routers, what is the most likely cause of the problem?
A. Authentication needs to be changed to PAP for both routers.
B. Serial ip addresses of routers are not on the same subnet.
C. Username/password is incorrectly configured.
D. Router names are incorrectly configured.
Answer:C
解释： 由图看出 密码配置有错误， 一个是 cisco ,一个是 cisco1
#p#
最新CCNA考题6.
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networking problem and the protocol or setting that should be used to prevent the problem?
A. routing loops, hold down timers
B. switching loops, split horizon
C. routing loops, split horizon
D. switching loops, VTP
E. routing loops, STP
F. switching loops, STP
Answer:F
解释：图中看出，是一交换机互连的有冗余连接的网络，
routing loops, hold down timers ,split horizon 这里都是路由网络中的一些概念
冗余连接的交换网络，
会出现： 交换环路 switching loops
解决方法： STP 生成树 协议
最新CCNA考题7.Assuming that a router contains both physical and logical interfaces,
what factor determines the OSPF router ID?
A. the lowest network number of any interface
B. the lowest IP address of any logical interface
C. the lowest IP address of any physical interface
D. the highest network number of any interface
E. the highest IP address of any logical interface
F. the highest IP address of any physical interface
Answer:E
解释： E is ok! 这也是我们在配置OSPF 路由的时候， 为了保证路由的稳定， 一般都会配置LOOPBACK 接口
WHY? LOOPBACK 接口 就是logical interface ， logical interface 为永远 UP 。
最新CCNA考题8.
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A. Host 1 - 192.168.10.22/24; Host 2 - 192.168.10.23/24; Host 3 - 192.168.10.24/24
B. Host 1 - 192.168.10.22/24; Host 2 - 192.168.11.23/24; Host 3 - 192.168.10.23/24
C. Host 1 - 192.168.10.22/24; Host 2 - 192.168.10.23/24; Host 3 - 192.168.11.23/24
D. Host 1 - 192.168.11.22/24; Host 2 - 192.168.11.23/24; Host 3 - 192.168.10.24/24
Answer:B
解释：每个VLAN 分别为一个 网段， 所以Host1, Host3 在同一网段， Host2 应该在其他的一个不同的网段
最新CCNA考题9.
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Which single access list statement will combine all four of these statements
into a single statement that will have exactly the same effect?
A. access-list 10 permit 172.29.16.0 0.0.0.255
B. access-list 10 permit 172.29.16.0 0.0.1.255
C. access-list 10 permit 172.29.16.0 0.0.3.255
D. access-list 10 permit 172.29.16.0 0.0.15.255
E. access-list 10 permit 172.29.0.0 0.0.255.255
Answer:C
解释 : 0.0.3.255 表示第3部分， 最后2位可变: 分别为：
00 (0) ＋ 16 代表了16
01 (1) ＋ 16 代表了17
10 (2) ＋ 16 代表了18
11 (3) ＋ 16 代表了19
最新CCNA考题10.
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Refer to the graphic. A host is connected to switch port Fa0/3 with a crossover cable.
The host and switch have been fully configured for IP connectivity as shown.
However, the port indicator on switch port Fa0/3 is not on,
and the host can not communicate with any other hosts including those connected to VLAN 2 on the same switch.
Based on the information given, what is the problem?
A. Switch port Fa0/3 is not configured as a trunk port.
B. The cable is the wrong type.
C. The switch has been assigned an incorrect subnet mask.
D. Switch port Fa0/3 has been blocked by STP.
E. The switch and the hosts must be in the same subnet.
Answer:B
解释 : PC与交换机 互连应该使用直通线
PC与PC, PC与路由器，路由器ETHERNET 与路由器ETHERNET ， 互连才需要使用crossover cable。
这就是十道最新CCNA考题。
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