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Question ID 14493

OSPF routing uses the concept of areas. What are the characteristics of OSPF areas?
(Choose Three.)

Option A

Each OSPF area requires a loopback interface to be configured.

Option B

Areas may be assigned any number from 0 to 65535.

Option C

Area 0 is called the backbone area.

Option D

Hierarchical OSPF networks do not require multiple areas.

Option E

Multiple OSPF areas must connect to area 0.

Option F

Single area OSPF networks must be configured in area 1.

Correct Answer B,C,E
Explanation Explanation: Definition of OSPF areas: An OSPF network may be structured, or subdivided, into routing to simplify administration and optimize traffic and resource utilization. Areas are identified by 32-bit numbers, expressed either simply in decimal, or often in octet-based dot-decimal notation, familiar from IPv4 address notation. See discussion following Cisco Learning discussion. https://learningnetwork.cisco.com/message/90832


Question ID 14494

Refer to the exhibit.

Which two statements are true about the loopback address that is configured on RouterB?
(Choose two.)

Option A

It ensures that data will be forwarded by RouterB.

Option B

 It provides stability for the OSPF process on RouterB.

Option C

It specifies that the router ID for RouterB should be 10.0.0.1.

Option D

 It decreases the metric for routes that are advertised from RouterB.

Option E

 It indicates that RouterB should be elected the DR for the LAN.

Correct Answer B,C
Explanation 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) - 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 routers physical interfaces will be chosen. -> The loopback interface will be chosen as the router ID of RouterB -

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