Cisco 642-883 Dumps 2021

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Online 642-883 free questions and answers of New Version:

NEW QUESTION 1
Refer to the exhibit.
642-883 dumps exhibit
Which Cisco IOS XR configuration is missing to complete the configuration task of enabling BFD with only the OSPF peer over the gi0/3/0/1 interface in area 0?

  • A. bfd fast-detect also needs to be enabled globally under router ospf 100. RP/0/RSP0/CPU0:P1(config-ospf)#bfd fast-detect
  • B. bfd fast-detect also needs to be enabled for the OSPF area under area 0. RP/0/RSP0/CPU0:P1(config-ospf-ar)#bfd fast-detect
  • C. bfd fast-detect also needs to be enabled for the OSPF interface under area 0 interface gi0/3/0/1.RP/0/RSP0/CPU0:P1(config-ospf-ar-if)#bfd fast-detect
  • D. bfd fast-detect also needs to be enabled globally on the route
  • E. RP/0/RSP0/CPU0:P1(config#bfd fast-detect
  • F. bfd fast-detect also needs to be enabled on the gi0/3/0/1 interface under interface gi0/3/0/1.RP/0/RSP0/CPU0:P1(config-if)#bfd fast-detect

Answer: C

Explanation:
bfd fast-detect
To enable Bidirectional Forwarding Detection (BFD) to detect failures in the path between adjacent forwarding engines, use the bfd fast-detect command in the appropriate configuration mode. To return the software to the default state in which BFD is not enabled, use the no form of this command.
bfd fast-detect [disable | ipv4] no bfd fast-detect

NEW QUESTION 2
DRAG DROP
642-883 dumps exhibit

  • A. Mastered
  • B. Not Mastered

Answer: A

Explanation:
Totally Stubby Area – O,OIA , OE1 or OE2 types of OSPf routes NSSA Totally Stubby – O, and O*IA types of OSPF routes
Stubby OSPF Area - O, OIA and O*IA types of OSPF routes NSSA – O,OIA , ON1 or ON2 types of OSPF Routes

NEW QUESTION 3
An engineer checks the logs in a PE with several customers and sees this output.
*Nov 3 21:44:54:219: %TCP-6-BADAUTH: No MD5 digest from 192.168.1.2(179) to 192.168.1.1(15926) (RST) tableid -0.
Which routing protocol is reporting the issue?

  • A. RIPng
  • B. BGP
  • C. OSPF
  • D. EIGRP

Answer: B

NEW QUESTION 4
What is defined by using the Cisco IOS XR policy-global configuration command?

  • A. the default BGP route policy
  • B. global variables that can be referenced by any route policy
  • C. the global default route policy
  • D. hierarchical route policy
  • E. nested route policy

Answer: B

Explanation:
Global Configuration Mode Prompt: (config)
Enter global configuration mode from executive (EXEC) mode by using the configure command. Global configuration commands generally apply to the whole system rather than just one protocol or interface. You can enter all other configuration submodes listed in this section from global configuration mode.
RP/0/RP0/CPU0:router# configure RP/0/RP0/CPU0:router(config)#
Global Parameter Configuration Mode Prompt: (config-rpl-gl)
Enter global parameter configuration mode by using the policy-global command in global configuration mode.
In global parameter configuration mode, you can create or modify a global policy by entering successive commands and then terminating the configuration by entering the end- global command.
For example, to configure global parameters: RP/0/RP0/CPU0:router(config)# policy-global RP/0/RP0/CPU0:router(config-rp-gl)# glbpathtype ebgp RP/0/RP0/CPU0:router(config-rp-gl)# glbtag 100 RP/0/RP0/CPU0:router(config-rp-gl)# end-global

NEW QUESTION 5
Nonstop Forwarding works with the Stateful Switchover feature in Cisco IOS and IOS XR software. Which three restrictions for OSPF are true? (Choose three.)

  • A. OSPF NSF for virtual links is not supported.
  • B. OSPF NSF for virtual links is supported.
  • C. OSPF NSF for sham links is not supported.
  • D. OSPF NSF for sham links is supported.
  • E. OSPF NSF supports NSF/SSO for IPv6 traffic only.
  • F. OSPF NSF supports NSF/SSO for IPv4 traffic only.

Answer: ACF

NEW QUESTION 6
Refer to the exhibit.
642-883 dumps exhibit
IS-IS adjacency is not established between XR2 and R1. Which action fixes this issue?

  • A. unify IS-IS process IDs on each router
  • B. configure on R1 under IS-IS is-type level-1-2
  • C. configure on R1 under IS-IS area-password CISCO
  • D. configure on XR2 under IS-IS under Gi0/0/0/0 address-family ipv4 unicast

Answer: D

NEW QUESTION 7
Which configuration is used when matching a prefix-list <name> in a route map?

  • A. match ip address prefix-list mylist
  • B. match ip address mylist
  • C. match ip next-hop mylist
  • D. ip local-policy route-map mylist
  • E. ip-policy route-map mylist

Answer: A

NEW QUESTION 8
Which statement best describes the function of a BGP af-group?

  • A. Allows grouping and reuse of session-templates to simplify address-family configuration tasks.
  • B. Allows common address family-specific configuration to be grouped together to simplify configuration tasks.
  • C. Allows common address family-independant configuration to be grouped together to simplify configuration tasks.
  • D. Allows grouping and reuse of neighbor-templates to simplify address-family configuration tasks.

Answer: B

NEW QUESTION 9
Which four statements are correct regarding IS-IS operations? (Choose four.)

  • A. By default, Level 1 routers within an IS-IS area do not carry any routing information external to the area to which they belon
  • B. They use a default route to exit the area.
  • C. Summarization should be configured on the Level 2 routers, which injects the Level 2 routes into Level 1.
  • D. IS-IS supports "route leaking" in which selected Level 2 routes can be advertised by a Level 1/Level 2 router into Level 1.
  • E. The IS-IS backbone is a contiguous collection of Level 1 capable routers, each of which can be in a different area.
  • F. With IS-IS, an individual router is in only one area, and the border between areas is on the link that connects two routers that are in different areas.
  • G. Cisco IOS XR Software supports multitopology for IPv6 IS-IS unless single topology is explicitly configured in IPv6 address-family configuration mode.

Answer: ACEF

Explanation:
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.0/routing/configuration/guide/rc3isis.html#wp1148617
Single-Topology IPv6 Support
Single-topology IPv6 support on Cisco IOS XR software allows IS-IS for IPv6 to be configured on interfaces along with an IPv4 network protocol. All interfaces must be configured with the identical set of network protocols and all routers in the IS-IS area (for Level 1 routing) or the domain (for Level 2 routing) must support the identical set of network layer protocols on all interfaces.
When single-topology support for IPv6 is used, only narrow link metrics, also known as old- style type, length, value (TLV) arguments, may be employed. During single-topology operation, one shortest path first (SPF) computation per level is used to compute both IPv4 and IPv6 routes. Using a single SPF is possible because both IPv4 IS-IS and IPv6 IS-IS routing protocols share a common link topology.
Because multitopology is the default behavior in the software, you must explicitly configure IPv6 to use the same topology as IPv4 in order to enable single-topology IPv6. Configure the single-topology command in ipv6 address family configuration submode of the IS-IS router stanza.
Multitopology IPv6 Support
Multitopology IPv6 support on Cisco IOS XR software differs from Cisco IOS software in that IS-IS assumes that multitopology support is required as soon as it detects interfaces configured for both IPv6 and IPv4 within the IS-IS stanza.
You must use the metric-style wide command to configure IS-IS to wide link metrics as multitopology link advertisements.

NEW QUESTION 10
Which two methods implement high availability in OSPF on Cisco IOS XR? (Choose two.)

  • A. NSF
  • B. NSR
  • C. BFD
  • D. fast hellos
  • E. sham-links

Answer: AB

NEW QUESTION 11
How many total OSPF virtual links are configured in this multiarea OSPF network which supports both OSPFv2 and OSPFv3 for IPv4 and IPv6 routing?
642-883 dumps exhibit
642-883 dumps exhibit
642-883 dumps exhibit
642-883 dumps exhibit
642-883 dumps exhibit

  • A. 1
  • B. 2
  • C. 3
  • D. 4

Answer: B

Explanation:
#Show running-config | include virtual – check how many router having “virtual “ entry

NEW QUESTION 12
Refer to the Cisco IOS XR route policy exhibit.
642-883 dumps exhibit
Which two statements are correct? (Choose two.)

  • A. "test" and "foo" are references to the community sets.
  • B. The "match-any" option indicates matching either the standard community or extended community.
  • C. Routes that match both the "test" and "foo" conditions will have their local preference setto 20.
  • D. All non-matching routes will be permitted.

Answer: AD

NEW QUESTION 13
Which option describes how an engineer must configure route summarization on a Cisco IOS XE OSPF-enabled network of routers?

  • A. area range command under the router OSPF process of the ABR
  • B. area range command under the router OSPF process of the router wanting to originate the summary route from
  • C. summary-address command under the OSPF process of the ABR
  • D. summary-address command under the OSPF process of the router wanting to originate the summary route from
  • E. network statement for the aggregate address under the router OSPF process on the ABR
  • F. network statement for the aggregate address under the router OSPF process of the router wanting to originate the summary route from

Answer: A

NEW QUESTION 14
What is the default OSPF seed metric and type?

  • A. 10 and E1
  • B. 10 and E2
  • C. 20 and E1
  • D. 20 and E2
  • E. 0 and E1
  • F. 0 and E2

Answer: D

NEW QUESTION 15
For which reason might an enterprise’s Internet circuits use private AS BGP peerings?

  • A. The enterprisewishes to obscure internal routing information from the Internet.
  • B. The enterprise owns their own IP space.
  • C. All redundant circuits are through the same provider.
  • D. The enterprise uses BGP confederations internally.

Answer: C

NEW QUESTION 16
What are two purposes of the BGP scan-time command? (Choose two.)

  • A. to tune the BGP process which walks the BGP table and confirms the reachability of next hops
  • B. to allow faster detection of downed BGP peers
  • C. to improve BGP convergence time
  • D. to tune the BGP update interval
  • E. to decrease the effects of unstable routes by increasing the route suppression time

Answer: AC

Explanation:
http://www.networkers-online.com/blog/2008/12/bgp-performance-tunning-convergence-stability-scalabilityand-nsf-part-2/
Background BGP scanner
It is responsible for BGP housekeeping by scanning both the BGP RIB and the IP RIB and cleaning and sorting things out.
BGP monitors the next hop of the installed routes to verify next-hop reachability and to select, install, and validate the BGP best path. By default, the BGP scanner polls the RIB for this information every 60 seconds.
During the 60 second time period between scan cycles, IGP instabilities or other network failures can cause temporarily black holes and routing loops.
NOTE With Cisco IOS the default timer is 60 seconds for the IPv4 address family and 15 seconds for the
VPNv4 address family in order to optimize the VPNs routing table convergence. This timer can be controlled via the following command:
Router(config-router)#bgp scan-time <5-60>

NEW QUESTION 17
Which option is a mechanism that can be implemented between two eBGP peers to communicate updates that each peer needs from the other?

  • A. ORF
  • B. route map
  • C. ACL
  • D. prefix list

Answer: A

NEW QUESTION 18
Refer to the OSPF command exhibit.
642-883 dumps exhibit
Which effect does the no-summary command option have?

  • A. It will cause area 1 to be able to receive non-summarized inter-area routes.
  • B. It will cause area 1 to not receive any inter-area routes and will use a default route to reach networks in other areas.
  • C. It will cause area 1 to not receive any external routes and will use a default route to reach the external networks.
  • D. It will convert the NSSA area into a NSSA totally stubby area.
  • E. It will convert the stubby area into a NSSA.
  • F. It will disable OSPF auto-summary.

Answer: B

Explanation:
642-883 dumps exhibit
C:Documents and Settingsuser-nwzDesktop1.JPG

NEW QUESTION 19
Which two statements regarding OSPFv2 or OSPFv3 authentication are correct? (Choose two.)

  • A. OSPFv2 supports MD5 authentication.
  • B. OSPFv2 supports MD5 or SHA authentication.
  • C. OSPFv2 relies on the native security stack that uses IPsec.
  • D. OSPFv3 supports MD5 authentication.
  • E. OSPFv3 supports MD5 or SHA authentication.
  • F. OSPFv3 relies on the native security stack that uses IPsec.

Answer: AF

NEW QUESTION 20
DRAG DROP
642-883 dumps exhibit

  • A. Mastered
  • B. Not Mastered

Answer: A

Explanation:
Only used within an AS and has a default value of 100 – Local Preference Can use the prepending feature to influence inbound traffic flow – AS_Path
The lower of this value is the more desirable value .Used to influence the incoming traffic flow from the neighbor autonomous systems. -- MED
Proprietary to cisco and no sent to any BGP peers. Its local to router only -Weight

NEW QUESTION 21
DRAG DROP
642-883 dumps exhibit

  • A. Mastered
  • B. Not Mastered

Answer: A

Explanation:
Matches the end of the AS Path String ---$ Matches the Start of the AS Path String ----^
Matches any single character --- . Matched any delimiter ---- -

NEW QUESTION 22
Which three BGP configuration groupings are supported on Cisco IOS XR Software? (Choose three.)

  • A. peer-group
  • B. af-group
  • C. bgp-group
  • D. session-group
  • E. neighbor-group
  • F. as-group

Answer: BDE

Explanation:
•Commands relating to a peer group found in Cisco IOS Release 12.2 have been removed from Cisco IOS XR software. Instead, the af-group, session-group, and neighbor-group configuration commands are added to support the neighbor in Cisco IOS XR software:
–The af-group command is used to group address family-specific neighbor commands within an IPv4 or IPv6 address family. Neighbors that have the same address family configuration are able to use the address family group name for their address family- specific configuration. A neighbor inherits the configuration from an address family group by way of the use command. If a neighbor is configured to use an address family group, the neighbor will (by default) inherit the entire configuration from the address family group. However, a neighbor will not inherit all of the configuration from the address family group if items are explicitly configured for the neighbor.
–The session-group command allows you to create a session group from which neighbors can inherit address family-independent configuration. A neighbor inherits the configuration from a session group by way of the use command. If a neighbor is configured to use a session group, the neighbor (by default) inherits the session group's entire configuration. A neighbor does not inherit all the configuration from a session group if a configuration is done directly on that neighbor.
–The neighbor-group command helps you apply the same configuration to one or more neighbors. Neighbor groups can include session groups and address family groups. This additional flexibility can create a complete configuration for a neighbor. Once a neighbor group is configured, each neighbor can inherit the configuration through the use command. If a neighbor is configured to use a neighbor group, the neighbor (by default) inherits the
neighbor group's entire BGP configuration.
–However, a neighbor will not inherit all of the configuration from the neighbor group if items are explicitly configured for the neighbor. In addition, some part of the neighbor group's configuration could be hidden if a session group or address family group was also being used.

NEW QUESTION 23
Which two unique attributes are used for the loop prevention mechanism when route reflectors are deployed in a network? (Choose two.)

  • A. local preference
  • B. originator-ID
  • C. AS-path
  • D. next-hop
  • E. origin
  • F. cluster-list

Answer: BE

NEW QUESTION 24
......

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