Subnetting -2
Can you identify? Network address, if you are given a host address and subnet mask 192.16.10.15 255.255.255.240 How can you find it: 192.16.10.15 AND 255.255.255.240
Identify Network Address Find if the two given host addresses are in the same network 192.168.10.90 255.255.255.192 192.168.10.120 255.255.255.192 AND the network address with respective subnet masks and find the network address Yes, they are on the same network
Show IP route - identify different entries C 192.168.1.0/24 is directly connected, Ethernet0 150.50.0.0/24 is subnetted, 1 subnets C 150.50.200.0 is directly connected, Loopback1 C 192.168.123.0 is directly connected, Serial0 C 192.168.111.0 is directly connected, Serial1 R 10.0.0.0 [120/1] via 192.168.123.1, 00:00:00, Serial0 [120/1] via 192.168.111.2, 00:00:00, Serial1 S* 0.0.0.0/0 [1/0] via 192.168.1.1 C – Directly connected S – Static S* - Default route R – RIP route [120/1]. This indicates both the administrative distance and the metric (the 120 is the AD, and the 1 is the hop-count metric
Find Preferred Route S 192.168.0.0/16 [1 / 0] via 10.1.1.1 AD Metric AD: Administrative Distance : Smaller the better Metric : Smaller the better R 192.168.111.0/24 [120/1] via 192.168.123.1, 00:00:00, Serial0 R 192.168.111.0/24 [120/5] via 192.168.5.2, 00:00:00, Serial1
Two redundant paths Serial 0 192.168.1.0/24 1.5Mbps Serial 1 R 192.168.1.0/24 [120/1] via 192.168.123.1, 00:00:00, Serial0 R 192.168.1.0/24 [120/5] via 192.168.5.2, 00:00:00, Serial1
Find Preferred Route O 192.168.111.0/24 [110/58] via 192.168.131.1, 00:00:00, Serial3 R 192.168.111.0/24 [120/1] via 192.168.123.1, 00:00:00, Serial0 administrative distance chooses the route it “trusts” the most. route with the lowest administrative distance is always preferred, regardless of metric
Find Preferred Route R 192.168.111.0/24 [120/1] via 192.168.123.1, 00:00:00, Serial0 S 192.168.0.0/16 [1/0] via 10.1.1.1 Route with longest prefix is preferred, i.e., with more bits in the subnet mask Route with longest prefix is more definitive
Which route will be selected to 192.168 network? O 192.168.111.0/24 [110/58] via 192.168.131.1, 00:00:00, Serial3 R 192.168.111.0/24 [120/1] via 192.168.123.1, 00:00:00, Serial0 R 192.168.111.0/24 [120/5] via 192.168.5.2, 00:00:00, Serial1 S 192.168.0.0/16 [1/0] via 10.1.1.1 Prefix-Length: prefix- length is always considered first Metric Administrative Distance - lowest administrative distance – 120/110/1 route with the lowest administrative distance is always preferred, regardless of metric (assuming the prefix-length is equal). Thus, the metric is calculated first, but not preferred first over AD.
What are the following modes used for R1 > user exec mode.. Example... R1 (config) # configuration mode Example R1# privilege mode R1 (config –if)# interface configuration mode
Conditions to bring up interface Fast Ethernet IP Address subnet mask no shutdown Serial Interface Clock rate