Question

5. BGP (Border Gateway Protocol) routers advertise routes between Autonomous Systems. Autonomous Systems are numbered and the table entries will provide the paths from AS to AS based on a longest prefix match of the incoming packet. Based on the following table, decide which AS path the following packets will take Prefix Origin AS AS Path 128.32.0.0/16 28.0.0.0/8 128.32.168.0 /24 128.1.1.4 /32 128.32.5.0 /24 123 123 15 10 14 56 12.3 34 101 203 123 50 15 123 23 10 160 105 a. 128.1.1.4 b. 128.1.1.6 c. 128.32.5.10 d. 128.32.168.6 e. 128.32.170.0 f. 128.10.123.0 g. 128.32.5.0

Answer 1

Packets AS Path

128.1.1.4 123 23 10

128.1.1.6 123 23 10

128.32.5.10 160 10 5

128.32.168.6 50 15

128.32.170.0 14 56 123

128.10.123.0 34 101 203 123

128.32.5.0 160 10 5