October 19, 2023
October 19, 2023
October 19, 2023
###### GATE 1989
October 19, 2023
 Question 49

Consider the following routing table at an IP router:

For each IP address in Group I identify the correct choice of the next hop from Group II using the entries from the routing table above.

```     Group I                 Group II
(i) 128.96.171.92        (a) Interface 0
(ii) 128.96.167.151      (b) Interface 1
(iii) 128.96.163.121     (c) R2
(iv) 128.96.165.121      (d) R3
(e) R4
```
 A i-a, ii-c, iii-e, iv-d B i-a, ii-d, iii-b, iv-e C i-b, ii-c, iii-d, iv-e D i-b, ii-c, iii-e, iv-d
Question 49 Explanation:
Do the AND operation of group I IP address with Netmask and compare the result with network number. if it match with network number, forward packet through that interface.
Ex: 128.96.167.151 AND 255.255.254.0 = 128.96.166.0
Therefore packet will forward through R2.
Question 49 Explanation:
Do the AND operation of group I IP address with Netmask and compare the result with network number. if it match with network number, forward packet through that interface.
Ex: 128.96.167.151 AND 255.255.254.0 = 128.96.166.0
Therefore packet will forward through R2.