1. Consider the following 4-router network. Assume routers R1, R2, R3 and R4 run the routing protocol indicated in the table, and routes have converged. Assume R3 and R4 have set the Bandwidth on their serial link interfaces to 2 Mbps.
   1. (12 pts) Fill in the table below with the cost for each link. Use Cisco RIP. For EIGRP, use the delays found in the EIGRP Delay slide 24 in 7EIGRP Concepts.

Link	RIP	EIGRP	OSPF
100 Mbps Ethernet
10 Mbps Ethernet
2 Mbps Serial
1 Gbps Ethernet

1. (12 pts) Fill in the table below with the [AD/cost] for destination 192.168.4.0/24 that will be in each router's routing table when it uses the indicated routing protocol.

Router	Destination	RIP [AD/cost]	EIGRP [AD/cost]	OSPF [AD/cost]
R1	192.168.4.0/24
R2	192.168.4.0/24
R3	192.168.4.0/24
R4	192.168.4.0/24

1. (2 pts) What is the purpose of AD (Administrative Distance)? Which route to 192.168.4.0/24 would be in the global routing table given your answers in part b above.

The administrative distance (AD) is a number used to rate the trustworthiness of the routing information received from a neighbor router. It is used when a router must choose between routes learned using different routing protocols, each routing protocol has a default AD value.

1. (8 pts) Assume that R1, R2, R3 and R4 are configured with OSPF and in the same area. What type of link would each of the following be:
   1. R1-R2 link:
   2. R2-R3 link:
   3. R3-R4 link:
   4. R4-server:

(12 pts) Suppose R3 is an ABR between Area 0 (R1, R2, R3) and Area 1 (R3, R4). List the commands needed at R3 to set the hostname, assign IP addresses to each interface (s0/0 and s0/1), set the bandwidth, activate each interface, and configure OSPF.