ibps-so 2016 · Question 182 of 394

The network cell has tabulated for the technology committee the three routing protocols that the bank's estate employs or may employ. Exactly one entry in the table is wrong, and the cell has been asked to nd it before the paper is circulated. Protocol Class of algorithm Metric RIP Distance Hop count, 15 being the version 2 vector greatest usable value OSPF version 2 BGP version 4 Link state Path vector Carried over UDP, port 520 Cost, ordinarily derived from Directly over IP, the bandwidth of the protocol number interface 89 The AS path together with policy attributes TCP, port 179 Scope claimed in the paper Interior — within one autonomous system Interior — within one autonomous system Interior — within one autonomous system The entry that is wrongly stated, and its correction, are:

1. AThe metric entered against RIP version 2: the greatest usable hop count in RIP is 255, not 15
2. BThe class entered against OSPF version 2: OSPF is a distance-vector protocol, not a link-state protocol
3. CThe transport entered against OSPF version 2: OSPF is carried over TCP port 179, not directly over IP
4. DThe scope entered against BGP version 4: BGP is the exterior gateway protocol of the internet, spoken between autonomous systems to exchange reachability information, and is not an interior protocolCorrect
5. EThe metric entered against BGP version 4: BGP selects its route upon hop count alone, policy attributes playing no part in the decision