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642-887 PDF DEMO:

QUESTION NO: 1
Which two statements are correct in describing ISP environments that are running IP/MPLS in the core network? (Choose two.)
A. On the PE routers, each BGP route must use a unique label to reach the BGP next hop.
B. The PE and P routers run LDP to learn the labels for reaching the BGP next-hop addresses.
C. A full mesh of IBGP sessions are required between all of the PE and P routers to ensure proper packets forwarding.
D. The BGP next hops point to the PE routers, and only the PE routers are required to run BGP.
Answer: B,D

QUESTION NO: 2
Which two network devices are trusted endpoints in a network? (Choose two.)
A. PC
B. video endpoint
C. IP phone
D. wireless clients
Answer: B,C

QUESTION NO: 3
Which four pieces of information are stored for each prefix in the LFIB? (Choose four.)
A. incoming interface
B. next-hop IP address
C. outgoing interface
D. Layer 2 header rewrite information
E. outgoing label
F. local label
Answer: B,C,E,F
Explanation
Forwarding Labeled Packets
LSR forwards the packet based on:
Top Label value of the received packet
Corresponding entry in LFIB (LABEL <=> INTERFACE)
#show mpls forwarding-table - will show:
local label
outgoing label
prefix (network)
outgoing interface
next-hop
LSR expects packet to come with "top" label being "Local" (from show mpls forwarding-table).
If Outgoing label is "Aggregate", then that means that this is a summary route and more specific lookup is performed.
If LSR cannot find label/interface mapping in LFIB, then it drops the packet.
There are several "RESERVED" labels numbered from 0 to 15:
0 - explicit NULL - is used to preserver QoS info through EXP bits. It copies 'ip prec' or DiffServ.
1 - Router alert label - forces LSR to software switch the packet.
3 - Implicit NULL - this label is used for "connected" or "summary" routes. This way LSR signals it s neighbors to execute "POP label" operation on "connected" routes. It is called PHP, Penultimate
Hop Popping, and is used to make sure that LSR does not perform 2 lookups (label + ip).
14 - OEM alert label - is used for monitoring purpose.
In Cisco IOS, the default range is 16 through 100,000, but can be expanded by using "mpls label range" command.

QUESTION NO: 4
Given this configuration of an interface for MPLS traffic engineering on a Cisco IOS XE router:
interface POS1/1/0
mpls traffic-eng tunnels
ip rsvp bandwidth 5000
Which option lists the equivalent configurations required on a Cisco IOS XR router?
A. mpls traffic-eng
interface POS1/1/0
B. mpls traffic-eng
interface POS1/1/0
rsvp
interface POS1/1/0
bandwidth 5000
C. interface POS1/1/0
mpls traffic-eng tunnels
ip rsvp bandwidth 5000
D. mpls traffic-eng
interface POS1/1/1
bandwidth 5mb
E. mpls traffic-eng
interface POS1/1/0
rsvp
interface POS1/1/0
Answer: B

QUESTION NO: 5
When using the tunnel mpls traffic-eng path-option 1 explicit name test command in Cisco
MPLS TE tunnel configurations, the test explicit-path configuration will consist of a list of which values?
A. resource class affinity
B. IP address
C. MPLS label
D. tunnel endpoint
Answer: B
Explanation
tunnel mpls traffic-eng path-option
To configure a path option for a Multiprotocol Label Switching (MPLS) traffic engineering tunnel, use the tunnel mpls traffic-eng path-option command in interface configuration mode. To disable the specified path option, use the no form of this command.
tunnel mpls traffic-eng path-option number {dynamic | explicit {name path-name | path-number}}
[lockdown] no tunnel mpls traffic-eng path-option number {dynamic | explicit {name path-name
| path-number}} [lockdown]
Syntax Description
number = When multiple path options are configured, lower numbered options are preferred.
dynamic = Path of the LSP is dynamically calculated.
explicit = Path of the LSP is an IP explicit path.
name path-name = Path name of the IP explicit path that the tunnel uses with this option.
path-number = Path number of the IP explicit path that the tunnel uses with this option.
lockdown = (Optional) The LSP cannot be reoptimized.
Usage Guidelines
You can configure multiple path options for a single tunnel. For example, there can be several explicit path options and a dynamic option for one tunnel. Path setup preference is for lower (not higher) numbers, so option 1 is preferred.
Examples
The following example shows how to configure the tunnel to use a named IP explicit path:
Router(config-if)# tunnel mpls traffic-eng path-option 1 explicit name test

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Updated: May 28, 2022