Approved 642-883 Bootcamp 2021

NEW QUESTION 1
A network engineer wants to set the local preference to 100 for the specific BGP community sets of 100:1, 101:1, and 102:1. Which option can the engineer use to implement this through RPL, where the BGP community set list is made by the name of lowpri-communities?

• A. route-policy ch-prefif community matches lowpri-communities then set local-preference 100endifend-policy
• B. route-policy ch-prefif community eq lowpri-communities then set local-preference 100endifend-policy
• C. route-policy ch-prefif community matches-any lowpri-communities then set local-preference 100endifend-policy
• D. route-policy ch-prefif community neq lowpri-communities then set local-preference 100endifend-policy

Answer: C

NEW QUESTION 2
DRAG DROP
Drag and drop the configuration steps on the left into the correct order on the right for nonstop forwarding for IS-IS on Cisco IOS XR.

• A. Mastered
• B. Not Mastered

Answer: A

Explanation:
Step 1 – conf t Step 2 – router isis Step 3 - nsf
Step 4 – nsf lifetime Step 5 - commit

NEW QUESTION 3
Refer to the show command output in the exhibit.

For which reason will this router drop all traffic that is destined to the 1.1.1.0/24 network?

• A. The 1.1.1.0/24 route is not synchronized.
• B. The BGP next hop for reaching the 1.1.1.0/24 network is not reachable.
• C. The metric of the 1.1.1.0/24 route is set to 0.
• D. The weight of the 1.1.1.0/24 route is set to 0.
• E. The 1.1.1.0/24 route is an incomplete route.
• F. The IBGP split-horizon rule is preventing the router to use the IBGP route.

Answer: B

NEW QUESTION 4
When configuring IPv4 and IPv6 IS-IS routing on Cisco IOS XR routers, which three statements are correct? (Choose three.)

• A. By default, a single SPF is used for both IPv4 and IPv6, so the IPv4 and IPv6 topology should be the same.
• B. By default, the IS-IS router type is Level 1 and Level 2.
• C. All IS-IS routers within the same IS-IS area must be configured with the same IS-IS routing process instance ID.
• D. By default, metric-style narrow is used.
• E. By default, the IS-IS interface circuit type is Level 1 and Level 2.
• F. The area IS-IS address-family configuration command is used to specify the IS-IS area address.

Answer: BDE

Explanation:

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The default metric style for single topology is narrow metrics. However, you can use either wide metrics or narrow metrics. How to configure them depends upon how single-topology is configured. If both IPv4 and IPv6 are enabled and single-topology is configured, the metric style is configured in the address-family ipv4 stanza. You may configure the metric style in the address-family ipv6 stanza, but it will be ignored in this case. If IPv6 only is enabled and single topology is configured, then the metric style is configured in the address-family ipv6 stanza.

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NEW QUESTION 5
Which option is an invalid BGP community representation?

• A. binary
• B. autonomous system number : value
• C. hexadecimal
• D. decimal

Answer: C

NEW QUESTION 6
An engineer wants to define a route policy that sets MED to a given value in case the extended community attributes of a network prefix match at least one of the values: 65000:10, 65000:20, or 65000:30. Which configuration accomplishes this task?

• A. extcommunity-set rt my-list 65000:1065000:2065000:30end-setroute-policy my-list ($med)if extcommunity rt matches-within my-list then set met $med
• B. extcommunity-set rt my-list 65000:1065000:2065000:30end-setroute-policy my-list ($med)if extcommunity rt matches-any my-list then set met $med
• C. extcommunity-set rt my-list 65000:1065000:2065000:30end-setroute-policy my-list ($med)if extcommunity rt matches-within my-list or med is $med is then set met $med
• D. extcommunity-set rt my-list 65000:1065000:2065000:30end-setroute-policy my-list ($med)if extcommunity rt matches-any my-list or med is $med then pass

Answer: B

NEW QUESTION 7
In a Cisco IOS XR OSPF NSF operation, which option is the result of a segment without NSF-capable peers?

• A. NSF is disabled on all segmentson any linecard that has a non-NSF-capable neighbor.
• B. NSF capabilities for that segment are disabled.
• C. NSF operates in unidirectional mode for that segment.
• D. NSF is disabled globally on the router.

Answer: B

NEW QUESTION 8
What is function of the RP/0/RSP0/CPU0:PE1(config-ospf)#distance Cisco IOS-XR command?

• A. To modify the administrative distance of the OSPF routes
• B. To modify the default seed metric of the OSPF external routes
• C. To modify the OSPF default reference bandwidth
• D. To modify the OSPF cost

Answer: A

Explanation:
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.8/routing/command/reference/rr38osp f.pdf

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NEW QUESTION 9
What are two ways to advertise networks into BGP? (Choose two.)

• A. using the neighbor router BGP command
• B. using a route policy in Cisco IOS XR Software or using a route map in Cisco IOS Software or Cisco IOS XE Software
• C. using route redistribution into BGP
• D. using the network router BGP command
• E. enabling an interface to run BGP using the interface router BGP command

Answer: CD

NEW QUESTION 10
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 11
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 12
When implementing LDP, what is liberal label retention mode?

• A. To reduce the convergence time, the LSR will retain all the received labels in its LIB even if all the neighbor LSRs go down temporary
• B. The LSR can assign it's own label for each destination network even though it has not been assigned a next hop label from the neighbor LSR
• C. The LSR will store the label received from the downstream LSRs in its LIB even if the downstream LSRs are not the next hop for the destination
• D. The LSR will not perform PHP if it is operating in liberal label retention mode

Answer: C

Explanation:
By default, LDP accepts labels (as remote bindings) for all prefixes from all peers. LDP operates in liberal label retention mode, which instructs LDP to keep remote bindings from all peers for a given prefix. For security reasons, or to conserve memory, you can override this behavior by configuring label binding acceptance for set of prefixes from a given peer.
The ability to filter remote bindings for a defined set of prefixes is also referred to as LDP inbound label filtering

NEW QUESTION 13
There are how many IS-IS area(s) defined in this network Scenario?

• A. 1
• B. 2
• C. 3
• D. 4

Answer: C

NEW QUESTION 14
DRAG DROP

• 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 15
A network specialist is working for a large enterprise that has a BGP-enabled multihomed core infrastructure. Recently, the ISP that provides Internet connectivity to the company
had to temporarily disable one of the BGP sessions as a result of routers blackholing BGP prefixes in transit. Which option can the specialist use to avoid this incident in the future?

• A. filtering local prefixes outbound
• B. using only one router as primary BGP speaker
• C. permitting only local prefixes outbound
• D. filtering external prefixes inbound

Answer: C

NEW QUESTION 16
Refer to the exhibit.

Which configuration is required on XR2 to enable MD5 IS-IS Authentication between R1 and XR2 using the password CISCO?

• A. Router isis ABCinterface GigabitEthernet0/0/0/0 hello-password encrypted CISCO
• B. Router isis ABCinterface GigabitEthernet0/0/0/0 hello-password hmac-md5 CISCO
• C. Router isis ABClsp-password hmac-md5 CISCO
• D. Router isis ABClsp-password encrypted CISCO

Answer: B

NEW QUESTION 17
Which two mandatory tasks must an IS-IS NSF-capable router perform for RP switchover? (Choose two.)

• A. Relearn the available IS-IS neighbors.
• B. Reacquire the contents of the LSD.
• C. Reset peering with the available IS-IS neighbors.
• D. Keep the existing contents of the LSD.
• E. Rediscover DIS for each link segment.

Answer: AB

NEW QUESTION 18
Refer to the exhibit.

XR4 must be configured to advertise only AS 100 local subnets to AS 10. Which configuration on XR4 achieves this goal?

• A. as-path-set LOCAL ios-regex ^$route-policy ADVif as-path in LOCAL then pass endif
• B. as-path-set LOCAL ios-regex '^100$' route-policy ADVif as-path in LOCAL then pass endif
• C. as-path-set LOCAL ios-regex '^$'route-policy ADVif as-path in LOCAL then pass endif
• D. as-path-set LOCAL ios-regex ^100$ route-policy ADVif as-path in LOCAL then pass endif

Answer: C

NEW QUESTION 19
Which of the following is used by an IS-IS router to detect other IS-IS neighbor routers and to form adjacencies?

• A. ESH
• B. ISH
• C. IIH
• D. PSNP
• E. CSNP

Answer: C

Explanation:
ISIS actually features three different hello types
An ES Hello (ESH) is send by all End Systems, and all IS devices listen for this Hello
An IS Hello (ISH) announces the presence of an IS - An IS Hello is sent by all IS devices, and End Systems listen for these hellos Finally, an IS-to-IS Hello (IIH) is used by an IS to discover other ISes and to form adjacencies with them A router will send an IIH to another router on the link to form or maintain an adjacency, but it will still send an ISH as well in case there are end systems located on that segment

NEW QUESTION 20
When redistributing routes into OSPF, which kind of routes will be redistributed by default on Cisco IOS XR Software but will not be automatically redistributed by default on Cisco IOS Software and Cisco IOS XE Software?

• A. Type 1 external routes
• B. Type 2 external routes
• C. subnetted routes
• D. /32 host routes
• E. tagged static routes

Answer: C

Explanation:

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NEW QUESTION 21
Refer to the exhibit.

R1 is advertising subnets 1.1.1.X/32 via eBGP. XR4 must accept only the first seven subnets in its BGP table. Which configuration must occur on XR2 to meet these parameters?

• A. route-policy INBOUNDif destination in SUBNETS then pass endifrouter bgp 100 neighbor 10.10.14.1 address-family ipv4 unicast route-policy INBOUND in
• B. route-policy INBOUNDif destination in FILTER then pass endifrouter bgp 100 neighbor 10.10.14.1 address-family ipv4 unicast route-policy INBOUND in
• C. router bgp 100neighbor 10.10.14.1 address-family ipv4 unicast route-policy FILTER in
• D. router bgp 100neighbor 10.10.14.1 address-family ipv4 unicast route-policy SUBNETS in

Answer: B

NEW QUESTION 22
When troubleshooting OSPF neighbor errors, which three verification steps should be considered? (Choose three.)

• A. Verify if neighboring OSPF interfaces are configured in the same area.
• B. Verify if neighboring OSPF interfaces are configured with the same OSPF process ID.
• C. Verify if neighboring OSPF interfaces are configured with the same OSPF priority.
• D. Verify if neighboring OSPF interfaces are configured with the same hello and dead intervals.
• E. Verify if neighboring OSPF interfaces are configured with the same area type.

Answer: ADE

NEW QUESTION 23
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