Cisco 642-691 Exam - Cheat-Test.com

Free 642-691 Sample Questions:

1.Based on the network diagram shown in the exhibit, both R5 and R6 are clients of the R2 RR.
When the 10.0.0.0/8 iBGP update from R3 is received by the R2 RR, which router(s) will R2 reflect the update to?

A.R1 only
B.R5 and R6
C.R5, R6 and R1
D.R4, R5 and R6
E.R4, R5, R6 and R1
F.to no other router
Answer: C

2.Based on this configuration, which two peering router neighbor statements are correct? (Choose two.)router bgp 50001 neighbor 192.168.1.1 remote­as 50001 neighbor 10.1.1.1 remote­as
50002 neighbor 10.1.1.1 local­as 50003 ! output omitted
A.EBGP ­ neighbor 10.1.1.2 remote­as 50003
B.EBGP ­ neighbor 10.1.1.2 remote­as 50001
C.EBGP ­ neighbor 10.1.1.2 remote­as 50001 and neighbor 10.1.1.2 local­as 50003
D.IBGP ­ neighbor 192.168.1.2 remote­as 50001
E.IBGP ­ neighbor 192.168.1.2 remote­as 50003
F.IBGP ­ neighbor 192.168.1.2 remote­as 50003 and neighbor 192.168.1.2 local­as 50001
Answer: C, D

3.What benefit does AToM provide to the service provider's customers?
A.By supporting Layer 2 VPNs, customers maintain control of their site­to­site routings over the WAN.
B.By supporting Layer 3 VPNs, a full mesh of virtual circuits will not be required between the different customer sites to enable optimal routing.
C.By supporting secured Layer 3 VPNs, customers do not have to deal with the complexity of configuring
IPSec.
D.By supporting MPLS traffic engineering over ATM, customers can better utilize their WAN link.
E.By supporting Diff­Serv QoS, AToM allows customers to deploy voice/video applications across the
WAN.
Answer: A

4.Which two statements about a transit AS are correct? (Choose two.)
A.A transit AS has eBGP connection(s) to only one external AS.
B.Routes between ASs are always exchanged via eBGP.
C.A transit AS uses an IGP like OSPF or ISIS to propagate the external networks within the transit AS.
D.Core routers within a transit AS normally use default routing to reach the external networks.
E.iBGP sessions can be established between non directly connected routers.
Answer: B, E

5.Refer to the exhibit and the following connectivity requirements. How many different VRFs are required? Sites CE1A, CE1B, CE1C, and CE1D require connectivity among them. Sites CE2A and CE2B require connectivity between them. Site CE12A requires connectivity to sites CE1A, CE1B, CE1C, CE1D, and CE12B. Site CE12B requires connectivity to sites CE2A, CE2B, and CE12A.

A.2 VRFs
B.3 VRFs
C.4 VRFs
D.6 VRFs
E.8 VRFs
F.10 VRFs
Answer: C

6.Refer to the exhibit. A diagram of a router connected to an MPLS­enabled ATM switch via an LC­ATM MPLS interface, and a partial configuration for the MPLS­enabled ATM switch and router are shown. Which statement describes what is incorrect about the configuration shown?

A.CEF has not been enabled on the router.
B.The VPI range of 2­3 is invalid.
C.The control VPI/VCI has not been set to 0/32 on the router.
D.VC­merge has not been enabled on the ATM switch interface.
E.The router has not been configured to specifically use LDP.
Answer: A

7.When using MPLS unicast IP forwarding, what will happen if an LSR receives an incoming labeled packet but the LSR can't find that incoming label in its LFIB?
A.The packet will be forwarded using the FIB.
B.The packet will be forwarded using the LIB.
C.The packet will be process switched by performing a route lookup in the routing table.
D.The packet will be forwarded using the LFIB with an imp­null outgoing label.
E.The packet will be dropped even if the IP destination exists in the FIB.
Answer: E

8.Refer to the exhibit. Based on the show outputs, which condition could be preventing the P1 router from establishing TDP adjacency with its neighbor over the s0/0.211 and s0/0.212 subinterfaces?

A.The s0/0.211 and s0/0.212 subinterfaces line protocol are in the down state.
B.The P1 router cannot establish a TCP session with its neighbors.
C.The P1 router is missing the mpls label protocol LDP command.
D.The show mpls tdp neighbor command needs to be used to view the TDP neighbor status.
Answer: B

9.With MPLS VPN­aware NAT, what additional information is tracked inside the NAT translation table?
A.RD information
B.RT information
C.VRF information
D.Multi­protocol BGP prefixes
E.MPLS Labels
Answer: C

10.What is the correct command to set the BGP scanner interval to two minutes?
A.bgp scan­time 2
B.bgp scan­time 120
C.bgp scan­time 2 60
D.The maximum scanning interval cannot exceed one minute.
Answer: D

11.Given the AS­path of (51002 51003) 51001 i from the show ip bgp output, what is the origin?
A.AS 51001
B.AS 51002
C.AS 51003
D.(51002 51003) E.IGP
F.IBGP
Answer: E

12.What best describes the following configuration example of allowas­in? router bgp 100 address­family ipv4 vrf CustomerAneighbor 195.12.4.5 remote­as 123 neighbor 195.12.4.5 activateneighbor 195.12.4.5 allowas­in 2
A.permits incoming BGP updates defined by access­list 2
B.permits incoming BGP updates defined by class­map 2
C.permit incoming BGP updates defined by route­map 2
D.permits incoming BGP updates with no more than two occurrences of AS 100 in the AS path
E.permits incoming BGP updates with no more than two occurrences of AS 123 in the AS path
Answer: D

13.In the diagram, the customer is using static routing to connect to the ISP. Which configuration on the ISP edge routers will enable load balancing and backup of the traffic to the customer?

A.! R1 ip route 10.1.1.0 255.255.255.128 serial 0 ! R2 ip route 10.1.1.128 255.255.255.128 serial 0
B.! R1 ip route 10.1.1.0 255.255.255.0 serial 0 ! R2 ip route 10.1.1.128 255.255.255.0 serial 0
C.! R1 ip route 10.1.1.0 255.255.255.128 serial 0 ip route 10.1.1.128 255.255.255.128 serial 0 ! R2 ip route 10.1.1.128 255.255.255.128 serial 0 ip route 10.1.1.0 255.255.255.128 serial 0
D.! R1 ip route 10.1.1.0 255.255.255.128 serial 0 ip route 10.1.1.0 255.255.255.0 serial 0 ! R2 ip route
10.1.1.128 255.255.255.128 serial 0 ip route 10.1.1.0 255.255.255.0 serial 0
Answer: D

14.When using the redistribute ospf {process­id} command, which types of OSPF routes will be redistributed into BGP?
A.all internal (interarea and intra­area) OSPF routes
B.all external OSPF routes
C.all external OSPF routes except type 7 LSAs
D.both internal and external OSPF routes
E.only classful OSPF routes without the subnet option
F.only external OSPF routes without the match option
Answer: A

15.Based on the network diagram shown in the exhibit, what is the correct configuration on the customer edge router used to conditionally announce the customer networks to the ISP?

A.router bgp 65001 ! neighbor commands not shown network 192.168.8.0 mask 255.255.252.0 ! ip route
192.168.8.0 255.255.252.0 192.168.8.33
B.router bgp 65001 ! neighbor commands not shown aggregate­address 192.168.8.0 255.255.252.0
summary­only ! ip route 192.168.8.0 255.255.252.0 192.168.8.33
C.router bgp 65001 ! neighbor commands not shown network 192.168.8.0 network 192.168.9.0 network
192.168.10.0 network 192.168.11.0 ! ip route 192.168.8.0 255.255.255.0 null0 ip route 192.168.9.0
255.255.255.0 null0 ip route 192.168.10.0 255.255.255.0 null0 ip route 192.168.11.0 255.255.255.0 null0
D.router bgp 65001 ! neighbor commands not shown aggregate­address 192.168.8.0 255.255.252.0
summary­only ! router ospf 1 network 192.168.8.0 0.0.3.255 area 0
E.router bgp 65001 ! neighbor commands not shown aggregate­address 192.168.8.0 255.255.252.0 ! ip route 192.168.8.0 255.255.252.0 null0
Answer: A

16.When configuring Internet access using a separate MPLS VPN, which three statements are correct? (Choose three.)
A.The Internet backbone is separate from the MPLS VPN backbone.
B.Two dedicated physical or logical links between the PE and the CE routers are required.
C.An Internet gateway is connected as a CE router to the MPLS VPN backbone.
D.An Internet gateway shall insert full Internet routing into the Internet VPN to achieve optimal routing.
E.The customer's Internet access is enabled by combining the Internet VPN with the Customer VPN using overlapping VPN topology.
Answer: A, C, E

17.What is the difference in implementation between a managed CE services MPLS VPN and a central services MPLS VPN?
A.RD assignment
B.selective routes export
C.selective routes import
D.MP­BGP route redistribution filtering
E.CE­PE routing process
F.none
Answer: B

18.Which four attributes are used by BGP to detect routing loops? (Choose four.)
A.AS­Path
B.Cluster ID
C.Cluster List
D.Originator ID
E.Community ID
Answer: A, B, C, D

19.Which configuration task requires configuring the bgp cluster­id {cluster­id} command?
A.configuring the member ASs within a BGP confederation
B.configuring the BGP confederation ID
C.configuring hierarchical BGP confederations
D.configuring redundant BGP confederations
E.configuring hierarchical route reflectors
F.configuring redundant route reflectors
Answer: F

20.During the autonomous system number migration process, which BGP feature allows a BGP router to act as a router within one autonomous system to some BGP neighbors but also appear to be in another autonomous system to other neighbors?
A.remove­private­as
B.local­as
C.as­path prepending
D.AS override E.Site­of­Origin (S00)
Answer: B

21.The MPLS VPN provider is using a separate Internet VPN to provide Internet access to its MPLS VPN customers. Currently, all of its customers are not able to access the Internet. The partial provider's CE­Internet router configuration is shown below. Based on the configuration, what could be the cause of the problem? ip route 0.0.0.0 0.0.0.0 10.1.1.1 ! router bgp 51001 network
0.0.0.0 neighbor 10.2.2.2 remote­as 51002 ! PE neighbor router neighbor 10.2.2.2 prefix­list test1 out neighbor 10.3.3.3 remote­as 51001 ! Another Internet router neighbor 10.3.3.3 prefix­list test2 out ! ip prefix­list test2 permit 0.0.0.0/0 ip prefix­list test1 permit 0.0.0.0/0 ge 1
A.The test2 prefix­list should be applied to the 10.2.2.2 neighbor and the test1 prefix­list should be applied
to the 10.3.3.3 neighbor.
B.Both prefix­lists should be applied in the "in" direction instead of the "out" direction.
C.The network command is missing the mask 0.0.0.0 option.
D.The network command is missing the mask 255.255.255.255 option.
E.The neighbor 10.2.2.2 activate and the neighbor 10.3.3.3 activate commands are missing.
Answer: A

22.In a Transit AS, how do the internal routers within the Transit AS forward packets destined for the external networks using a scalable solution?
A.using the default route
B.using the IGP routes where the external networks are redistributed into the IGP by the edge routers
C.using the EBGP routes where the external networks are redistributed into the IBGP by the edge routers
D.using the IBGP routes, then using recursive lookup based on IGP information to resolve the BGP next­hop
Answer: D

23.Based on the R1 router BGP configuration shown, which three statements are correct? (Choose three.)

A.R1 is in AS 50101 according to the 192.168.100.1 neighbor.
B.R1 is in AS 50101 according to the 10.1.1.1 neighbor.
C.The 192.168.100.1 neighbor must be directly connected to R1.
D.R1 is a route­reflector client.
E.The 10.4.4.4 neighbor is an EBGP neighbor.
F.BGP updates coming in from the 192.168.100.1 neighbor must be processed by the setlp route­map.
Answer: A, C, F

24.Refer to the exhibit. The MPLS VPN Customer A is using a separate interface for Internet access. However, with the current configurations shown, the CE router is not receiving any Internet routes from the PE router. Which two additional configuration commands can resolve the Internet connectivity issue? (Choose two.)

A.At the CE router, under router bgp 50101, add the neighbor 10.1.1.66 remote­as 50102 command.
B.At the CE router, under router bgp 50101, add the network 0.0.0.0 command.
C.At the CE router, under router bgp 50101, add the ip route 0.0.0.0 0.0.0.0 10.1.1.66 command.
D.At the PE router, under address­family ipv4 vrf Customer_A, add the neighbor 10.1.1.65 remote­as 50101 command.
E.At the PE router, under address­family ipv4 vrf Customer_A, add the neighbor 10.1.1.17 default­originate command.
F.At the PE router, under router bgp 50102, add the neighbor 10.1.1.65 remote­as 50101 command.
Answer: A, F

25.The core routers within a transit AS are running both IBGP and IGP. The edge routers within the transit AS are using the next­hop­self option to establish the IBGP sessions. What can be implemented to improve the routing performance to all external prefixes?
A.enable route redistribution from BGP into IGP
B.disable BGP synchronization on all the core routers
C.enable CEF on all the core and edge routers
D.enable route redistribution from IGP into BGP
E.use route reflectors within the core
Answer: C

26.When routes between MP­BGP and RIP are being redistributed, what does the option metric transparent do?
A.copies the BGP MED into the RIP hop count
B.copies the BGP local preference into the RIP hop count
C.copies the RIP hop count into the BGP local preference D.copies the RIP hop count into the BGP MED
E.uses the default seed metric when redistributing from MP­BGP into RIP F.uses the default seed metric when redistributing from RIP into MP­BGP
Answer: A

27.Given the following configurations, R2 and R3 are not able to successfully establish the IBGP session using the loopback 0 interfaces. What could be the cause of this problem?!! output omitted!hostname R2!interface loopback 0ip address 2.2.2.2!interface e0ip address 10.1.1.1
255.255.255.0no shut!interface e1ip address 10.2.2.1 255.255.255.0no shut!router bgp
65101neighbor 172.16.1.1 remote­as 65100neighbor 3.3.3.3 remote­as 65101!router eigrp
101network 10.0.0.0network 2.0.0.0!!! output omitted!hostname R3!interface loopback 0ip address
3.3.3.3!interface e0ip address 10.1.1.2 255.255.255.0no shut!interface e1ip address 10.2.2.2
255.255.255.0no shut!router bgp 65101neighbor 192.168.1.1 remote­as 65102neighbor 2.2.2.2
remote­as 65101!router eigrp 101network 10.0.0.0network 3.0.0.0!

A.The "No Sync" BGP configuration command is missing.
B.R2 and R3 are not using the loopback0 IP address as the source address for the BGP messages to each other.
C.The "network 2.0.0.0" BGP configuration command is missing on R2 and the "network 3.0.0.0" BGP configuration command is missing on R3.
D.The "neighbor 2.2.2.2 ibgp­multihop 2" BGP configuration command is missing on R3 and the "neighbor 3.3.3.3 ibgp­multihop 2" BGP configuration command is missing on R2.
Answer: B