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Q1. 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
Q2. Refer to the exhibit.
Which configuration is correct for XR4 for an e-BGP session with R1?
A. router bgp 100 neighbor 10.10.14.1 remote-as 100
B. router bgp 100 neighbor 10.10.14.1 remote-as 10 address-family ipv4 unicast
C. router bgp 100 address-family ipv4 unicast neighbor 10.10.14.1 remote-as 100 address-family ipv4 unicast
D. router bgp 100 address-family ipv4 unicast neighbor 10.10.14.1 remote-as 100
Answer: C
Q3. In which network environment is IS-IS adjacency check important?
A. in a multitopology environment where there are different instances of IS-IS running on the same router
B. in an IPv4/IPv6 environment and running single-topology IS-IS
C. when a level L1/L2 IS-IS router is neighboring with a Level 1 only or Level 2 only router
D. when IS-IS neighbors are in an NBMA environment like over Frame Relay
E. when IS-IS neighbors are in a broadcast environment like an Ethernet LAN
Answer: B
Explanation:
C:Documents and Settingsuser-nwzDesktop1.JPG
Q4. 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 down. The router ID changes only if the router reloads or if the OSPF routing process restarts.
E. In OSPF version 3, the OSPF router ID uses a 128-bit number.
Answer: A,B,D
Q5. 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 ADV if as-path in LOCAL then pass endif
B. as-path-set LOCAL ios-regex '^100$' route-policy ADV if as-path in LOCAL then pass endif
C. as-path-set LOCAL ios-regex '^$' route-policy ADV if as-path in LOCAL then pass endif
D. as-path-set LOCAL ios-regex ^100$ route-policy ADV if as-path in LOCAL then pass endif
Answer: C
Q6. An engineer is working for a service provider who is strategically important to the Internet data traffic. The CTO is promoting a core infrastructure upgrade to connect via optical links network service providers. Which three concerns must be addressed while planning the new BGP features and functionalities? (Choose three.)
A. BGP suboptimal routing
B. IPv4 exhaustion
C. routers and switches hardware capabilities
D. route dampening of current customers
E. multihoming policies of new customers
F. IGP reconvergence time on the inter-AS links
G. BGP blackholing when acting as transit autonomous system
Answer: A,C,G
Q7. When configuring BGP on Cisco IOS XR Software, which address-family is enabled by default?
A. IPv4 unicast
B. IPv6 unicast
C. VPNv4
D. IPv4 unicast and IPv6 unicast
E. IPv4 unicast and IPv6 unicast and VPNv4
F. No address-family is enabled by default.
Answer: F
Explanation:
http://www.cisco.com/en/US/docs/ios_xr_sw/iosxr_r3.8/routing/command/reference/rr38bg p.pdf
An address family must be explicitly configured in the router configuration mode for the address family to be active in BGP. Similarly, an address family must be configured under the neighbor for the BGP session to be established for that address family. An address family must be configured in router configuration mode before it can be configured under a neighbor.
Q8. 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 ABC interface GigabitEthernet0/0/0/0 hello-password encrypted CISCO
B. Router isis ABC interface GigabitEthernet0/0/0/0 hello-password hmac-md5 CISCO
C. Router isis ABC lsp-password hmac-md5 CISCO
D. Router isis ABC lsp-password encrypted CISCO
Answer: B