import mpls 2.0

Question 1

In SR, TE tunnels natively support ECMP, in traditional MPLS a full mesh of tunnels would be required

Answer 1

True

Question 2

11.7 PCE-PCC Architecture • PCE-PCC architecture is client-server that assists in the creation of SR-TE Multidomain • The heart of the Multidomain SR-TE concept is SDN and the introduction of a Network Controller • Terminology o PCE – _____________________ o PCC - _____________________ o PCEP - _____________________

Answer 2

Path Computation Element Path Computation Client Path Computation Element Protocol

Question 3

PCEP - Path Computation Element Protocol • Uses port 3189 TCP

Answer 3

4189

Question 4

• _______________ o Describes a set of procedures by which a PCC / Headend delegates tunnel control to the PCE o The PCE can request the PCC to update or modify the parameters of the LSP under its control • _______________ o PCE must learn the topology to compute paths  Via IGP  Via BGP LS

Answer 4

Stateful PCE, Stateless PCE

Question 5

FRR The backup tunnel does not reserve bandwidth

Answer 5

True

Question 6

RSVP hellos cannot be used to trigger FRR

Answer 6

False

Question 7

The autotunnel backup feature can be used to simplify and automate the deployment of many backup tunnels for link and node protection

Answer 7

True

Question 8

The Cisco multiprotocol label switching traffic engineering ______________ feature allows you to set up a full mesh of TE point-to-point tunnels automatically, with a minimal set of Cisco MPLS TE configurations.

Answer 8

autotunnel mesh (automesh)

Question 9

If the overall length of the labeled packet (including the shim header) is greater than the MPLS MTU, the packet is discarded.

Answer 9

False, the packet is fragmented

Question 10

The interface MTU size (and therefore also the MPLS MTU) is increased automatically on WAN interfaces but the MPLS MTU needs to be increased manually on LAN interfaces.

Answer 10

True

Question 11

MTU for IP = 1500 + 3 labels

Answer 11

1500B + 3x4B = 1512

Question 12

What is the most likely cause of the problem below? R10#show mpls ldp discovery Local LDP Identifier: 10.100.255.10:0 Discovery Sources: Interfaces: Ethernet0/0 (ldp): xmit Ethernet0/1 (ldp): xmit/recv LDP Id: 10.100.255.9:0

Answer 12

LDP not activated or ACL filtering packets destined for 636 on the remote host

Question 13

LDP is a soft state protocol

Answer 13

False, RSVP is

Question 14

RSVP Header Fields ___ – Contains the list of hops

Answer 14

ERO

Question 15

RSVP Header Fields ___ – Contains the constraints that must be met by the path: Bandwidth, affinity bits, etc

Answer 15

Resource Request

Question 16

RSVP Header Fields ___ – Label request

Answer 16

Label request

Question 17

Typically IGPs have information about links, IPs, and link costs, but do not have bandwidth information

Answer 17

True

Question 18

Point out which items are announced by the IGP additionally when TE is activated

Answer 18

Bandwidth reservable, Bandwidth used by MPLS TE, Affinity, MPLS TE Metric

Question 19

Which OSPF LSA is responsible for carrying TE Metric, Bandwidth, affinity, etc. (resource information)

Answer 19

LSA 10

Question 20

What command will show whether a tunnel has protection or not?

Answer 20

show mpls traffic-engineering tunnels tu 0 protection