CCNA 200-125 Exam: MPLS Questions With Answers

Which statement about MPLS is true?
- A. It operates in Layer 1.
- B. It operates between Layer 2 and Layer 3.*
- C. It operates in Layer 3.
- D. It operates in Layer 2.
Show (Hide) Explanation/Reference
MPLS operates at a layer that lies between traditional definitions of Layer 2 (data link layer) and Layer 3 (network layer), and thus is often referred to as a “layer 2.5” protocol.
Which two statements about MPLS are true? (Choose two)
- A. It provides automatic authentication
- B. It can carry multiple protocols, including IPv4 and IPv6*
- C. It encapsulates all traffic in an IPv4 header
- D. It uses labels to separate and forward customer traffic*
- E. It tags customer traffic using 802.1q
Show (Hide) Explanation/Reference
MPLS supports IPv4, IPv6, IPX, AppleTalk at the network layer. MPLS supports Ethernet, Token Ring, FDDI, ATM, FR, PPP at the link layer.

MPLS uses label switching to forward packets over Ethernet. Labels are assigned to packets based on groupings or forwarding equivalence classes (FECs). The label is added between the Layer 2 and the Layer 3 header.