MPLS

Question 1

An MPLS header is added to packet that lies between ______
1) layer 1 and 3
2) layer 2 and 3
3) layer 3 and 4
4) none of the above

Answer 1

layers 2 and 3

Question 2

MPLS is considered to be ______ protocol
1) layer 2
2) layer 2.5
3) layer 3
4) none of the above

Answer 2

layer 2.5

Question 3

The MPLS Header is ____ bit long
1) 24
2) 32
3) 40
4) 64

Answer 3

32 bit
Label: 20 bit
Exp(QoS): 3 bit
Bottom of stack: 1 bit
TTL: 8 bit

Question 4

routers that receive IP packet from CE
Routers and add MPLS header.
1) Ingress LSR
2) Egress LSR
3) Intermediate LSR

Answer 4

Ingress LSR
LSR: Label Switch Router

Question 5

LSR routers that swap label in MPLS header
and assigned for forwarding labeled IP packet.
1) Ingress LSR
2) Egress LSR
3) Intermediate LSR

Answer 5

Intermediate LSR
LSR: Label Switch Router

Question 6

LSR routers that send IP packet to CE routers
and removes MPLS header.
1) Ingress LSR
2) Egress LSR
3) Intermediate LSR

Answer 6

Egress LSR
LSR: Label Switch Router

Question 7

Routers used in MPLS network that can
understand labels. (MPLS enabled router)
1) PE
2) CE
3) LSR

Answer 7

LSR: Label Switch Router

Question 8

MPLS stands for

Answer 8

Multiprotocol Label Switching

Question 9

Action od addition of label by LSR is
1) Push
2) Pop
3) Swap

Answer 9

Push

Question 10

Action of removal of label by LSR is
1) Push
2) Pop
3) Swap

Answer 10

Pop

Question 11

MPLS label attachment is regulated by
1) OSPF
2) BGP
3) LDP
4) EGP

Answer 11

LDP: Label Distribution Protocol

Question 12

In MPLS, LFIB stands for

Answer 12

Label Forwarding Information Base
(main information based on label switching happens)

Question 13

LSR learns routes and add this information in
1) LFIT
2) LFIB

Answer 13

LFIB: Label Forwarding Information Base

Question 14

In MPLS, LSP stands for

Answer 14

Label Switched Path

Question 15

MPLS _________ (provides/ does not provide) encryption by itself

Answer 15

does not provide

Question 16

Label Switched Path (LSP) is
1) unidirectional
2) bidirectional

Answer 16

unidirectional

Question 17

MPLS takes the help of _______
protocol to distribute the proper labels
within the MPLS domain to create LSP
1) RSVP-TE
2) MP-BGP
3) LDP
4) EGP

Answer 17

LDP: Label Distribution Protocol

Question 18

used for traffic engineered LSP and resource reservation in MPLS
1) RSVP-TE
2) MP-BGP
3) LDP
4) EGP

Answer 18

RSVP-TE: Resource Reservation Protocol - Traffic Engineering

Question 19

Distributes the Layer 2/Layer 3 VPN labels
1) RSVP-TE
2) MP-BGP
3) LDP
4) EGP

Answer 19

MP-BGP: Multi Protocol BGP
BGP provides the label

Question 20

during traffic engineering mechanism
1) Push
2) Pop
3) Swap
4) Swap & Push

Answer 20

Swap & Push

Question 21

AToM stands for

Answer 21

Any Transport over MPLS

Question 22

In MPLS header the label is ____no of bits
1) 16
2) 20
3) 24
4) 30

Answer 22

20