Which statements describe the routing protocol OSPF? (Choose three.)
A.
It supports VLSM.
B.
It is used to route between autonomous systems.
C.
It confines network instability to one area of the network.
D.
It increases routing overhead on the network.
E.
It allows extensive control of routing updates.
F.
It is simpler to configure than RIP v2.
Variable length subnet masking (VLSM) is a more efficient way of subnetting a network. When you perform classful subnetting, all the subnets must use the same subnet mask, forcing them to each use the same number of hosts.
Ospf features:
i. Can use VLSM
ii. Converges quickly
iii. Uses the concept of areas which helps for route summarization
iv. Allows authentication
v. Uses Dijkstra’s algorithm (SPF Algorithm)
vi. Reduces the usage of bandwidth (BW) by sending triggered updates to announce changes in the network
vii. Sending periodic updates 30min interval. Uses short Hello messages on a short regular interval, with the absence of hello messages indicating that a neighbor is no longer reachable.
Finally, to confine network instability to one area of the network, OSPF uses router ID or a 32-bit IP address selected at the beginning of the OSPF process. The highest IP address configured on the router is the router ID. If a loopback address is configured, then it is the router ID. In case of multiple loopback addresses, the highest loopback address is the router ID. Once the router ID is elected it doesn’t change unless the IP address is removed or OSPF restarts.
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Open Shortest Path First (OSPF) is a routing protocol for Internet Protocol (IP) networks. It uses … subnet masking (VLSM) and Classless Inter-Domain Routing (CIDR) addressing models.
OSPF supports Variable Length Subnet Masks (VLSM). OSPF uses multicasting within areas
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