Cisco 642-883 Study Guides 2021

NEW QUESTION 1
A network engineer wants to set the local preference to 100 for the community set list lowpri-communities. Which option can the engineer use to implement this through RPL?

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

Answer: B

NEW QUESTION 2
Refer to the exhibit.

R2 does not have R1 1.1.1.1/32 subnet in its BGP table. Which issue can be causing this problem?

• A. XR4 does not have next-hop-self for a R2 iBGP session.
• B. R2 does not have no auto-summary configured.
• C. XR4 drops any update coming from R1.
• D. IPv4 address-family is not enabled on R1.

Answer: C

NEW QUESTION 3
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.

Answer:

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

NEW QUESTION 4
A network engineer must provide support to a very large customer running a flat IS-IS Level 2 network. The engineer is willing to redesign the infrastructure in a multiarea fashion due to the rapid growth of the data traffic and newly-required scaling factors. Which consideration is important when implementing the new IS-IS Level 1 areas?

• A. Two IS-IS Level 1 areas divided by the backbone area require a virtual link to communicate when Level 1/Level 2 intermediate systems are missing.
• B. The default behavior of an IS-IS Level 1 area is equivalent to anOSPF totally stubby area.
• C. An IS-IS Level 1 area will always set a gateway pointing to a backbone router.
• D. An IS-IS Level 1 area provides greater flexibility during the Database Descriptors exchange process.

Answer: B

NEW QUESTION 5
Refer to the route policies exhibit.

Which five route policies will cause the routes to be dropped or passed? (Choose five)

• A. route-policy one will cause the routes to be dropped.
• B. route-policy two will cause the routes to be dropped.
• C. route-policy three will cause the routes to be dropped.
• D. route-policy four will cause the routes to be dropped.
• E. route-policy five will cause the routes to be dropped.
• F. route-policy one will cause the routes to be passed.
• G. route-policy two will cause the routes to be passed.
• H. route-policy three will cause the routes to be passed.
• I. route-policy four will cause the routes to be passed.
• J. route-policy five will cause the routes to be passed.

Answer: ACEGI

NEW QUESTION 6
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 7
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 8
A Cisco IOS XR router is a member in OSPF 1 and EIGRP 100 domains, and needs to redistribute OSPF learned routes into EIGRP. Which configuration achieves this goal?

• A. router eigrp 100address-family ipv4 redistribute ospf 1
• B. router eigrp 100redistribute ospf 1 route-policy OS_INTO_EIGroute-policy OS_INTO_EIG set eigrp-metric 100 10 255 1 155
• C. router eigrp 100address-family ipv4redistribute ospf 1 route-policy OS_INTO_EIGroute-policy OS_INTO_EIG set eigrp-metric 100 10 255 1 155
• D. router eigrp 100default-metric 100 1 255 1 1500redistribute ospf 1

Answer: C

NEW QUESTION 9
Which two options are characteristics of Nonstop Forwarding and Nonstop routing? (Choose two.)

• A. NSR is graceful redundancy mechanism.
• B. NSR is stateful redundancy mechanism.
• C. NSF is stateful redundancy mechanism.
• D. NSF is graceful redundancy mechanism.

Answer: BD

NEW QUESTION 10
Cisco IOS XE has OSPF area authentication configured for MD5 and interface authentication configured for clear text. Which configuration takes precedence?

• A. null
• B. area
• C. MD5
• D. interface

Answer: D

NEW QUESTION 11
Which three statements are true regarding the OSPF router ID? (Choose three.)

• A. The OSPF routing process chooses a router ID for itself when it starts up.
• B. The router-id command is the preferred procedure to set the router ID.
• C. If a loopback interface is configured, its address will always be preferred as the router ID over any other methods.
• D. After the router ID is set, it does not change, even if the interface that the router is using for the router ID goes dow
• E. The router ID changes only if the router reloads or if the OSPF routing process restarts.
• F. In OSPF version 3, the OSPF router ID uses a 128-bit number.

Answer: ABD

NEW QUESTION 12
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 13
Refer to the OSPF command 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:
C:Documents and Settingsuser-nwzDesktop1.JPG

NEW QUESTION 14
An engineer is troubleshooting an OSPF adjacency between the R1 and R2 and is seeing the following debug:
R2#debug ip ospf adj
*May 10 17:48:27.459: OSPF: Rcv pkt from 10.1.2.1, FastEthernet1/0 : Mismatch Authentication type. Input packet specified type 1, we use type 2
Which option describes why the adjacency cannot be established?

• A. R1 is configured for plaintext authentication.
• B. R1 is not configured for authentication.
• C. R2 is not configured for authentication.
• D. R2 is configured for plaintext authentication.

Answer: A

NEW QUESTION 15
Which option is the minimum required configuration to enable PIM on a Cisco IOS XR router interface?

• A. router pim address-family ipv4interface GigabitEthernet0/0/0/0
• B. router piminterface GigabitEthernet0/0/0/0 address-family ipv4enable
• C. router pim address-family ipv4interface GigabitEthernet0/0/0/0 enable
• D. router piminterface GigabitEthernet0/0/0/0 enable
• E. router pim address-family ipv4interface GigabitEthernet0/0/0/0 address-family ipv4enable

Answer: D

NEW QUESTION 16
When configuring Cisco IOS XR route policy nesting, which command is used within a route policy to call another route policy?

• A. Apply
• B. Continue
• C. Jump
• D. Go to
• E. Call

Answer: A

Explanation: http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.7/routing/command/reference/rr37plc y.html
Examples
In the following example, the policy CustomerIn applies the route-policy SetLocalPref to conditionally set the local preference on a route. The parameters 20, 30, 40, and 50 are passed to the parameterized policy SetLocalPref, where the local preference is set to:
•20, if the community 217:20 is present in the route
•30, if the community 217:30 is present in the route
•40, if the community 217:40 is present in the route
•50, if the community 217:50 is present in the route
RP/0/RP0/CPU0:router(config)# route-policy SetLocalPref ($lp0, $lp1, $lp2, $lp3,
$lp4)
RP/0/RP0/CPU0:router(config-rpl)# if community matches-any ($lp0:$lp1)then RP/0/RP0/CPU0:router(config-rpl-elseif)# set local-preference $lp1 RP/0/RP0/CPU0:router(config-rpl-elseif)# elseif community matches-any ($lp0:$lp2) then
RP/0/RP0/CPU0:router(config-rpl-elseif)# set local-preference $lp2 RP/0/RP0/CPU0:router(config-rpl-elseif)# elseif community matches-any ($lp0:$lp3) then
RP/0/RP0/CPU0:router(config-rpl-elseif)# set local-preference $lp3 RP/0/RP0/CPU0:router(config-rpl-elseif)# elseif community matches-any ($lp0:$lp4) then
RP/0/RP0/CPU0:router(config-rpl-elseif)# set local-preference $lp4 RP/0/RP0/CPU0:router(config-rpl-elseif)# endif RP/0/RP0/CPU0:router(config-rpl)# end-policy RP/0/RP0/CPU0:router(config)# route-policy CustomerIn($cust)
RP/0/RP0/CPU0:router(config-rpl)# apply SetLocalPref ($cust, 20, 30, 40, 50) RP/0/RP0/CPU0:router(config-rpl)# end-policy RP/0/RP0/CPU0:router(config)# route-policy Cust_217 RP/0/RP0/CPU0:router(config-rpl)# apply CustomerIn(217) RP/0/RP0/CPU0:router(config-rpl)# end-policy

NEW QUESTION 17
Refer to the exhibit.

Area 1 routers must have only a default route in their OSPF routing tables. Which configuration must be completed on XR2 to meet this requirement?

• A. router ospf 1 address-family ipv4interface GigabitEthernet0/0/0/1 area 1 stub no-summary
• B. router ospf 1area 1 stub no-summary
• C. router ospf 1 area 1 stubinterface GigabitEthernet0/0/0/1
• D. router ospf 1area 1 stub no-summary interface GigabitEthernet0/0/0/1

Answer: D

NEW QUESTION 18
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 19
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