New CCNA MPLS Questions & Answers With Explanation

By | November 19, 2017

Question 1
Which routing protocol do MPLS providers typically use internally in the provider’s network?
A. MP-BGP
B. EIGRP
C. OSPF
D. IS-IS
Answer A.

Explanation
MPLS providers typically use Multiprotocol-Border Gateway Protocol (MP-BGP) internally. This is because MP-BGP can advertise multiple routes while allowing logical separation between customers’ routes.

Question 2
You have been asked to recommend a private WAN technology. All of the remote offices have varied physical connectivity paths. Which private WAN technology should you recommend?
A. MPLS
B. Metro Ethernet
C. PPPoE
D. GRE tunnels
Answer A.

Explanation
Multiprotocol Label Switching allows for varied access links such as serial leased lines, Frame Relay, Metro Ethernet, and so on. You can leverage the existing connectivity methods to form a private WAN.




Question 3
Which statement about using MPLS and dynamic routing protocols is true?
A. CE routers form neighbor relations with other CE routers.
B. CE routers form neighbor relations with PE routers.
C. CE routers receive their routing updates with route redistribution from PE routers.
D. CE routers receive their routing updates with route redistribution from other CE routers.
Answer C.

Explanation
CE routers do not form adjacencies or neighbors (depending on protocol) with other CE routers. They depend on PE routers and route redistribution of routing protocols to receive their routing updates and tables.

Question 4
When using MPLS and OSPF, the PE routers function as what?
A. Autonomous system boundary routers
B. Super backbone routers
C. Area border routers
D. Point-to-multipoint routers
Answer B.

Explanation
Every area must connect back to the backbone area, or area 0. However, CE routers cannot create neighborships with other sites. So the MPLS PE routers can either extend area 0 or create the area 0 network, which is called a super backbone.

Question 5
When working with the MPLS provider on providing QOS, which is a consideration for the customer?
A. MPLS support of DSCP markings
B. MPLS support of multiple access link technologies
C. Redistribution of routing protocols
D. Internal speed of the customer network

Answer B.

Explanation
Although all of these can be considerations for the customer, the largest impact can be the access link technology used between the PE and CE routers. If the customer uses Frame Relay, the QOS can be unusable because of discarded frames due to congestion.




Question 6
When a customer purchases MPLS and supports EIGRP, which statement is correct?
A. The customer can opt to have the PE provide EIGRP.
B. The customer can configure all of the EIGRP routers to use the same Autonomous System Number (ASN).
C. The customer must configure all of the EIGRP routers to use different Autonomous System Numbers (ASNs).
D. All of the routers must share the super backbone.
Answer B.

Explanation

The customer has the option to configure each site with a different Autonomous System Number (ASN) for EIGRP, or they can configure all sites with the same ASN.
Regardless, the routes would be route redistributed from the internal Multiprotocol-Border Gateway Protocol (MP-BGP) process on the Provider Edge (PE) routers.