Assume that the following number of routes (aka prefixes) exist in each of the networks:

Area 0: 50 routes

Area 1: 50 routes => stub area

Area 2: 50 routes => totally stubby area

Area 3: 50 routes => not so stubby area (NSSA)

AS 70: 100 routes

AS 50: 100 routes

(12%) Complete the entries in the table below:

Type of routes	Area 0 Routers	Area 1 Routers	Area 2 Routers	Area 3 Routers
# of O intra routes
# of IA routes
# of external routes
# of default routes
# of N2 routes
Total number of routes

(5%) Identify the router types (e.g. ABR, ASBR)

Router	Router Type
R1
R2
R3
R4
R5

(4%) Assume that you strive to minimize the number of router entries in your routers (as you always do!). What one change can you do (a configuration change of one of the areas) to reduce the number of router entries?

5. The AS160 multi-area OSPF autonomous network is shown below. SPAS-70- R5 AS 160 Area 3 R3 R2 ?1 Area 0 Area 1 Area 2 R4 ISP AS 50 5. The AS160 multi-area OSPF autonomous network is shown below. SPAS-70- R5 AS 160 Area 3 R3 R2 ?1 Area 0 Area 1 Area 2 R4 ISP AS 50