Information Technology Reference
In-Depth Information
continued
Gateway of last resort is not set
10.0.0.0/30 is subnetted, 3 subnets
R 10.10.10.0 [120/1] via 10.10.10.5, 00:00:21, Serial0/0/0
C 10.10.10.4 is directly connected, Serial0/0/0
R 10.10.10.8 [120/1] via 10.10.10.5, 00:00:21, Serial0/0/0
172.16.0.0/16 is variably subnetted, 8 subnets, 6 masks
R 172.16.0.0/18 [120/1] via 10.10.10.5, 00:00:21, Serial0/0/0
C 172.16.68.0/22 is directly connected, FastEthernet0/0
C 172.16.72.0/23 is directly connected, FastEthernet0/1
R 172.16.128.0/20 [120/1] via 10.10.10.5, 00:00:21, Serial0/0/0
R 172.16.160.0/21 [120/2] via 10.10.10.5, 00:00:21, Serial0/0/0
R 172.16.176.0/22 [120/2] via 10.10.10.5, 00:00:21, Serial0/0/0
R 172.16.188.0/23 [120/2] via 10.10.10.5, 00:00:21, Serial0/0/0
R 172.16.190.0/24 [120/2] via 10.10.10.5, 00:00:21, Serial0/0/0
The router, B2, receives a packet from 172.16.68.10 destined for 172.16.142.10. Use binary to prove
which route in Example 8-3 is the longest match. Make sure that you designate the bits that must
match between the IP address and the longest match route. If no route matches, simply state “No
match.”
Route 172.16.128.0/20 is the longest match
10101100.00010000.10001110.00001010
10101100.00010000.10000000.00000000
The router, B2, receives a packet from 172.16.72.10 destined for 172.16.179.10. Use binary to prove
which route in Example 8-3 is the longest match. Make sure that you designate the bits that must
match between the IP address and the longest match route. If no route matches, simply state “No
match.”
Route 172.16.176.0/22 is the longest match
10101100.00010000.10110011.00001010
10101100.00010000.10110000.00000000
The router, B2, receives a packet from 172.16.69.10 destined for 172.16.65.10. Use binary to prove
which route in Example 8-3 is the longest match. Make sure that you designate the bits that must
match between the IP address and the longest match route. If no route matches, simply state “No
match.”
No routes matches. The first child route, 172.16.0.0/18, is the closest to a longest match. The bits
match through the 17th bit. However, the destination's 18th bit is “on” whereas the 18th bit in
172.16.0.0/18 is “off.”
