1．Which of the following are true regarding the command output shown in the display? (Choose two.)
A. There are at least two routers participating in the RIP process.
B. A ping to 192.168.168.2 will be successful.
C. A ping to 10.0.15.2 will be successful.
D. RtrA has three interfaces participating in the RIP process.
Answer: AC
解释一下：因为RIP的metric是基于跳数的，在debug ip rip中RtrA发出的路由192.168.1.0的metric为2,所以在RIP进程下至少有两台路由器；而10.0.0.0 metric 1表示这个路由是自己直连的，所以A ping 10.0.15.2是能成功的。
2．What is the effect of using the service password-encryption command?
A. Only the enable password will be encrypted.
B. Only the enable secret password will be encrypted.
C. Only passwords configured after the command has been entered will be encrypted.
D. It will encrypt the secret password and remove the enable secret password from the configuration.
E. It will encrypt all current and future passwords.
Answer: E
解释一下：password encryption 是为了给密码加密。
3．Refer to the exhibit. Which two statements are true about inter VLAN routing in the topology that is shown in the exhibit? (Choose two.)
A. Host E and host F use the same IP gateway address.
B. Router1 and Switch2 should be connected via a crossover cable.
C. Router1 will not play a role in communications between host A and host D.
D. The FastEthernet 0/0 interface on Router1 must be configured with subinterfaces.
E. Router1 needs more LAN interfaces to accommodate the VLANs that are shown in the exhibit.
F. The FastEthernet 0/0 interface on Router1 and Switch2 trunk ports must be configured using the same encapsulation type.
Answer: DF
解释一下：为了实现相同相同交换机间的不同VLAN之间的通讯应该用的三层的设备，借助trunk来实现。因此要将Router 1和switch2相连的接口配置为trunk，trunk的模式还应该是相同的，不同的trunk的封装，是无法实现连通性的。
4．At which OSI layer is a logical path created between two host systems?
A. session
B. transport
C. network
D. data link
E. physical
Answer: C
解释一下：我们所说的IP地址就是一个逻辑的地址，他是在OSI七层模型中的第三层network层创建的。是用于通讯的逻辑的地址。
5. Refer to the exhibit. For what two reasons has the router loaded its IOS image from the location that is shown? (Choose two.)
A. Router1 has specific boot system commands that instruct it to load IOS from a TFTP server.
B. Router1 is acting as a TFTP server for other routers.
C. Router1 cannot locate a valid IOS image in flash memory.
D. Router1 defaulted to ROMMON mode and loaded the IOS image from a TFTP server.
E. Cisco routers will first attempt to load an image from TFTP for management purposes.
Answer: AC
解释一下：System image file is “tftp://172.16.1.129/Hampton/nitro/c7200-j-mz”这句话表明系统的镜像来自从 tftp。引导程序首先使用flash中所找到的第一个有效的IOS镜像，如果flash中没有有效的IOS镜像，引导程序将生成一个TFTP本地广播以定位TFTP服务器，如果没有找到TFTP服务器，引导程序将加载ROM中的迷你IOS（RXBOOT 模式），如果ROM中有迷你IOS，那么迷你IOS在随后加载并且进入RXBOOT模式；否则路由器不是重新试图寻找IOS镜像，就是加载ROMMON并且进入ROM Monitor模式。
因此说明Router 1在flash中没有找到有效的IOS镜像。从而加载了tftp中的镜像。
