星期三, 8月 05, 2009

Commands and applications used at layers 1 and 2

1. What would the following command allow you to do?
winipcfg

Capture events relating to data-link layer protocols
Identify a path to a destination device
View IP information for hosts running Windows 9x and Me
View the status of all connected devices and links without querying a DNS server


2. You are a network engineer working to isolate problems at the data-link layer with an end-system running a MAC OS X operating system. You want to view the path a packet takes through the network to 10.215.34.124.
What command allows you to do this?

trace 10.215.34.124
tracert [-d] 10.215.34.124
traceroute 10.215.34.124
track 1 ip route 10.215.34.124



3. Suppose you want to isolate a problem at the data-link layer by sending an echo request packet to the address www.easynomadtravel.com.
What command would allow you to do this?

arp -a
ping www.easynomadtravel.com
show ip interface brief
trace http://www.easynomadtravel.com/



4. You are a network engineer working to isolate problems at the data-link layer. As part of your troubleshooting strategy, you want to view entries in the ARP table of a Cisco router.
What command allows you to do this?

arp -a
show ip arp
show ip interface brief
show arp table

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