Information Technology Reference
In-Depth Information
M860 processor: part number 0, mask 49
2 FastEthernet/IEEE 802.3 interface(s)
2 Low-speed serial(sync/async) network interface(s)
191K bytes of NVRAM.
31360K bytes of ATA CompactFlash (Read/Write)
Configuration register is 0x2102
R1#
Examine the
show ip interface brief
command.
Step 5.
The
show ip interface brief
command displays a summary of the usability status informa-
tion for each interface. From privileged EXEC mode on the R1 router, examine the output
of the
show ip interface brief
command.
R1#
show ip interface brief
Interface
IP-Address
OK? Method Status
Protocol
FastEthernet0/0
192.168.1.1 YES manual up
up
FastEthernet0/1
unassigned
YES manual administratively down down
Serial0/0/0
192.168.2.1 YES manual up
up
Serial0/0/1
unassigned
YES manual administratively down down
Vlan1
unassigned
YES manual administratively down down
Task 10: Use the ping Command
The
ping
command is a useful tool for troubleshooting Layers 1 though 3 of the OSI model and diag-
nosing basic network connectivity. This operation can be performed at either the user or privileged
EXEC modes. Using
ping
sends an ICMP packet to the specified device and then waits for a reply.
Pings can be sent from a router or a host PC.
Use the
ping
command to test connectivity between the R1 router and PC1.
Step 1.
R1#
ping 192.168.1.10
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 192.168.1.10, timeout is 2 seconds:
.!!!!
Success rate is 80 percent (4/5), round-trip min/avg/max = 72/79/91 ms
Each exclamation point (!) indicates a successful echo. Each period (.) on the display indi-
cates that the application on the router timed out while it waited for a packet echo from a
target. The first ping packet failed because the router did not have an ARP table entry for
the destination address of the IP packet. Because there is no ARP table entry, the packet is
dropped. The router then sends an ARP request, receives a response, and adds the MAC
address to the ARP table. When the next ping packet arrives, it will be forwarded and be
successful.
