offer free latest cisco 642-661 exam
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Exam 642-661: Configuring BGP on Cisco Routers (BGP)
Related Certifications: CCIP
Number of Questions: 50-60
Duration: 90 minutes
TestInside 642-661
Cisco 642-661
CCIP Configuring BGP on Cisco Routers (BGP)
Q&A DEMO
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1.Look at the picture.
Answer:
2.Look at the picture.
Answer:
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3.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 192.168.0 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
aggregate-address 192.168.8.0 255.255.252.0 summary-only
!
ip route 192.168.8.0 255.255.252.0 192.168.8.33
C. route 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
TestInside 642-661
ip route 192.168.11.0 255.255.255.0 null0
D. router bgp 65001
! neighbor commands not shown
aggregate-address 192.168.8.0 255.255.252.0 summary-only
!
router ospf 1
network 192.168.8.0 0.0.3.255 area 0
E. router bgp 65001
! neighbor commands not shown
aggregate-address 192.168.8.0 255.255.252.0
!
ip route 192.168.0 255.255.252.0 null0
Answer: A
4.Which two of these statements regarding BGP and admin distances are correct? (Choose two.)
A. BGP admin distance does not influence the path selection algorithm, but does influence if BGP-learned routes are placed in the IP routing table.
B. External BGP routes have a default admin distance of 5. C. External BGP routes have a default admin distance of 20.
D. Internal BGP routes have a default admin distance of 5. E. Internal BGP routes have a default admin distance of 20.
F. BGP admin distances do not matter, since all BGP routes are automatically installed in the IP routing table. Answer: A, C
5.Which BGP router configuration command will enable an ISP edge router to advertise a default route to its BGP
neighbor even if a default route is not present in its BGP table?
A. router(config-router)#neighbor {ip-address} default-originate
B. router(config-router)#network 0.0.0.0
C. router(config-router)#network 0.0.0.0 mask 0.0.0.0
D. router(config-router)#default network 0.0.0.0
Answer: A
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6.What is the effect on existing BGP connections when Path MTU (PMTU) discovery is enabled?
A. They dynamically renegotiate the new MTU size.
B. After timing out, they will inherit the configured MTU size. C. The connections are reset and negotiate MTU size.
D. There is no effect on existing connections. Answer: D
7.What is a key benefit of implementing conditional route injection in BGP networks?
A. allows the injection of prefix summaries without using the aggregate-address command
PassGuide offers free demo for Certification Exams You can check out the interface, question quality and usability of our practice exams before you decide to buy it. We are the only one site can offer demo for almost all products. Download links:http://demo.passguide.com/downloadB. eliminates the need for static routes to inject a default route
C. provides for link redundancy by conditionally injecting active and standby routes
D. allows the injection of more specific routes based on administrative policies
E. eliminates the complexity of route aggregation when using the network command
Answer: D
8.Refer to the outputs shown in the exhibit. What could be preventing the R1 router from receiving any prefixes from the R2 BGP neighbor?
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A. There is a TCP session establishment problem between R1 and R2.
B. The no sync command is missing on R2. C. The no sync command is missing on R1.
D. R2 is using the wrong AS number in its neighbor 192.168.31.2 remote-as statement.
E. R1 is using the wrong AS number in its neighbor 192.168.31.1 remote-as statement.
F. Both R1 and R2 are not using a loopback address to source their BGP packets. Answer: E
9.Refer to the configuration shown. What could cause the BGP prefixes from the 10.1.1.1 BGP peer to be absent from the routing table?
A. intraconfederation EBGP configurations error
B. autosummarization C. ebgp-multihop issue D. BGP synchronization
E. EBGP configurations error
Answer: D
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10.A customer multihomed to two ISPs is assigned a different AS number from each ISP. In this case, which BGP
configuration option can the customer use to resolve this issue? A. set as-path prepend {as-number…}
B. neighbor {ip-address} filter-list {as-path acl number} out
C. neighbor {ip-address} filter-list {as-path acl number} in
D. neighbor {ip-address} local-as {private-as} E. neighbor {ip-address} ebgp-multihip
F. neighbor {ip-address} remove-private-as
Answer: D
Exam Topics Include:
BGP Overview, Including Session Establishment and Configuration
Route Selection Using Policy Controls
Route Selection Using Attributes
Classification and Marking
Customer-to-Provider Connectivity with BGP
BGP Transit Autonomous System
BGP Route Reflectors
Advanced BGP Configuration
Scaling IGP and BGP in Service Provider Networks
The 642-661 Border Gateway Protocol exam is a qualifying exam for the CCIP certification. The BGP exam assesses a candidate’s understanding of the theory of BGP, ability to configure BGP on Cisco IOS routers, and skills with troubleshooting on BGP. As a routing protocol, BGP is one of the underlying foundations of the Internet and is in prevalent in both ISP and customer networks.
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