If you convert a WAN connection with OSPF from T1 to a Frame Relay circuit, which two actions must you take to enable the connection? (Choose two)
A. Change the OSPF network type to nonbroadcast.
B. Manually configure neighbors in the OSPF process.
C. Manually configure the hello and dead timers.
D. Change the OSPF network type to broadcast.
E. Change the OSPF network type to multipoint nonbroadcast.
Correct answer: B, D
https://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13690-18.html
Introduction
This document provides initial configurations for Open Shortest Path First (OSPF) over non-broadcast links. On non-broadcast media such as Frame Relay, X.25, ATM, and Switched Multimegabit Data Service (SMDS), OSPF can run in two modes:
– Nonbroadcast Multiaccess (NBMA): simulates a broadcast model by election of a designated router (DR) and a backup designated router (BDR). There are two ways to simulate a broadcast model on an NBMA network:
define the network type as broadcast with the ip ospf network broadcast interface sub-command
or
configure the neighbor statements using the router ospf command.
– Point-to-mutipoint: treats non-broadcast network as a collection of point-to-point links by configuration of the ip ospf network point-to-multipoint command.
You must define the network type on non-broadcast networks in order to avoid configuration of neighbor statements. This document provides sample configurations for OSPF over non-broadcast links. Use the show ip ospf interface command in order to check the network type of an interface that runs OSPF and the command show ip ospf neighbor is used to know the status of the neighbor router.
BD?
https://ccieblog.co.uk/ospf/ospf-non-broadcast-nbma-network