Classless Interdomain Routing (CIDR) is also known as “supernetting”, in which y

Question

Classless Interdomain Routing (CIDR) is also known as “supernetting”, in which you group multiple subnets into one subnet number and netmask. It helps to combine or aggregate routes in a routing table.

Table 1 is a routing table using CIDR. Address bytes are in hexadecimal. The notation “/12” in C4.50.0.0/12 denotes a netmask with 12 leading 1 bits: FF:F0:00:00. Note that the last three entries cover every address and thus serve in lieu of a default route.

State to what next hop the following will be delivered:

a.) C4.5E.13.87

b.) C4.5E.22.09

c.) C3.41.80.02

d.) 5E.43.91.12

Explanation / Answer

the targets are as below

a)B

b)A

c)E

d)F

e)C

f) D (The starting 14 bits 0f c4.6B and C4.68 equal)

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