Refer to the exhibit.
Which two statements are true about the loopback address that is configured on RouterB?
(Choose two.)
A.
It ensures that data will be forwarded by RouterB.
B.
It provides stability for the OSPF process on RouterB.
C.
It specifies that the router ID for RouterB should be 10.0.0.1.
D.
It decreases the metric for routes that are advertised from RouterB.
E.
It indicates that RouterB should be elected the DR for the LAN.
Explanation:
A loopback interface never comes down even if the link is broken so it provides stability for the OSPF process (for example we use that loopback interface as the router-id) -> B is correct.
The router-ID is chosen in the order below:
+ The highest IP address assigned to a loopback (logical) interface.
+ If a loopback interface is not defined, the highest IP address of all active router’s physical interfaces will be chosen.
-> The loopback interface will be chosen as the router ID of RouterB -> C is correct.
Loopback address is a special IP number (127.0.0.1) that is designated for the software loopback interface of a machine. The loopback interface has no hardware associated with it, and it is not physically connected to a network
That’s not applicable when talking about routers. The loopback interfaces can have any address you want to assign to them. Think of the 127.0.0.1 address as an internal-only address that you wouldn’t assign to an interface.
Loopback, or loop-back, refers to the routing of electronic signals, digital data streams, or flows of items back to their source without intentional processing or modification. This is primarily a means of testing the transmission or transportation infrastructure.
Many example applications exist. It may be a communication channel with only one communication endpoint. Any message transmitted by such a channel is immediately and only received by that same channel. In telecommunications, loopback devices perform transmission tests of access lines from the serving switching center, which usually does not require the assistance of personnel at the served terminal. Loop around is a method of testing between stations that are not necessarily adjacent, where in two lines are used, with the test being done at one station and the two lines are interconnected at the distant station. A patch cable may also function as loopback, when applied manually or automatically, remotely or locally, facilitating a loop-back test.