2. 计算机
  3. You are the administrator of the Ezonexam LAN and you have been reviewing error logs of networking devices and notice a large nu

You are the administrator of the Ezonexam LAN and you have been reviewing error logs of networking devices and notice a large nu

admin2009-05-19  39
问题 You are the administrator of the Ezonexam LAN and you have been reviewing error logs of networking devices and notice a large number of errors associated with several MAC addresses. You suspect that some of the errors are being generated by the routers. Which router commands will allow you to find the ip address associated with each MAC address? (Choose two)
A. show arp
B. show version
C. show address
D. show hosts
E. show interface
F. show protocols
选项
答案A,E
解析 Explanation:
The "show arp" command Displays the entries in the ARP table, including their layer 2
MAC address and layer 3 IP address.

Example:
The following is the output for the show arp command on Router 1:
VE1 # show arp
Protocol Address Age (min) Hardware Addr Type Interface
Internet 10.0.0.3 0 0004.dd0c.ffcb ARPA Ethernet01
Internet 10.0.0.1 - 0004.dd0c.ff86 ARPA Ethernet0

To see the MAC (hardware) address of the router interfaces as well as their IP addresses, use the "show interfaces" command as shown in the example below:
VE1# show interfaces
Ethernet 0 is up, line protocol is up
Hardware is MCI Ethernet, address is 0000.0c00.750c (bia 0000.0c00.750c)
Internet address is 10.108.28.8, subnet mask is 255.255.255.0
MTU 1500 bytes, BW 10000 Kbit, DLY 100000 usec, rely 255/255, load 1/255
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