Observe the diagram. RTC is the hub router and RTA and RTB are the spokes. There are no
virtual circuits between the spoke locations. What is needed to successfully route traffic to
the 11.11.11.0/24 network from RTA?
A.
The neighbor 10.10.10.1 next-hop-self command on RTA.
B.
Nothing is required. This is the default behavior on this topology.
C.
The neighbor 10.10.10.1 next-hop-self command on RTB.
D.
The neighbor 10.10.10.1 next-hop-self command on RTC.
Explanation:
The following example illustrates the issue:
BGP Next Hop (NBMA)
If the common media as you see in the shaded area above is a frame relay or any NBMA
cloud then the exact behavior will occur as if we were connected via Ethernet. RTC will
advertise 180.20.0.0 to RTA with a next hop of 170.10.20.3.
The problem is that RTA does not have a direct PVC to RTD, and cannot reach the next
hop. In this case routing will fail.
In order to remedy this situation a command called next-hop-self is created.The next-hop-self Command
Because of certain situations with the next hop as we saw in the previous example, a
command called next-hop-self is created. The syntax is:
neighbor {ip-address|peer-group-name} next-hop-self
The next-hop-self command allows us to force BGP to use a specified IP address as the
next hop rather than letting the protocol choose the next hop.
In the previous example, the following configuration solves our problem:
RTC#
router bgp 300
neighbor 170.10.20.1 remote-as 100
neighbor 170.10.20.1 next-hop-self
RTC advertises 180.20.0.0 with a next hop = 170.10.20.2 http://www.cisco.com/warp/public/459/bgp-toc.html#bgpnexthop
I think it’s not a FR issue but an IBGP full mesh issue.
C. Option is correct
Answer D is correct.
For situations with the next hop, as in the BGP Next Hop (NBMA) example, you can use the next-hop-self command. The syntax is:
neighbor {ip-address | peer-group-name} next-hop-self
The next-hop-self command allows you to force BGP to use a specific IP address as the next hop.
For the BGP Next Hop (NBMA) example, this configuration solves the problem:
RTC#
router bgp 300
neighbor 170.10.20.1 remote-as 100
neighbor 170.10.20.1 next-hop-self
RTC advertises 180.20.0.0 with a next hop equal to 170.10.20.2.
reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/26634-bgp-toc.html#bgpnexthop
(4/July/2017 Updated) New 300-101 Exam Questions:
NEW QUESTION 379
What show command is used here?
TCB Local Address Foreign Address (state)
6523A4FC 10.1.25.3.11000 10.1.25.3.23 ESTAB
65239A84 10.1.25.3.23 10.1.25.3.11000 ESTAB
653FCBBC *.1723 *.* LISTEN
C. show tcp brief numeric
NEW QUESTION 380
You need the IP address of the devices with which the router has established an adjacency. Also, the retransmit interval and the queue counts for the adjacent routers need to be checked. What command will display the required information?
A. show ip eigrp adjacency
B. show ip eigrp topology
C. show ip eigrp interfaces
D. show ip eigrp neighbor
Answer: D
NEW QUESTION 381
You get a call from a network administrator who tells you that he typed the following into his router:
Router(config)#router ospf 1
Router(config-router)#network 10.0.0.0 255.0.0.0 area 0
He tells you he still can’t see any routes in the routing table. What configuration error did the administrator make?
A. The wildcard mask is incorrect
B. The OSPF area is wrong
C. The OSPF process ID is incorrect
D. The AS configuration is wrong
Answer: A
NEW QUESTION 382
If routers in a single area are configured with the same priority value, what value does a router use for the OSPF Router ID in the absence of a loopback interface?
B. The highest IP address of any physical interface
NEW QUESTION 383
Where are EIGRP successor routes stored?
D. In the routing table and the topology table
NEW QUESTION 384
Which location is traffic from IP SLAs?
C. WAN edge
NEW QUESTION 385
Which option is invalid redistribute from EIGRP into OSPF?
A. ACL
B. tag
C. metric
D. route map
Answer: A
NEW QUESTION 386
……
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New 300-101 Exam Questions and Answers (2/Nov/2017 Updated):
NEW QUESTION 465
Which two protocols can cause TCP starvation? (Choose two.)
A. TFTP
B. SNMP
C. SMTP
D. HTTPS
E. FTP
Answer: AB
NEW QUESTION 466
Refer to the exhibit. How can you configure a second export destination for IP address 192.168.10.1?
configure terminal
ip flow-export destination 192.168.10.1 9991
ip flow-export version 9
A. specify a different TCP port
B. specify a different UDP port
C. specify a VRF
D. configure a version 5 flow-export to the same destination
E. specify a different flow ID
Answer: C
NEW QUESTION 467
Which value does Frame Relay use to identify a connection between a DTE and DCE?
A. DLCI
B. IP address
C. MAC address
D. VLAN ID
Answer: A
NEW QUESTION 468
Which two options are limitations of Stateful NAT64? (Choose two.)
A. it is unable to route VRF traffic
B. it is unable to route multicast traffic
C. it supports FTP traffic only with an ALG
D. it supports DNS64 only
E. layer 4 supports TCP only
Answer: AB
NEW QUESTION 469
If you want to migrate an IS-IS network to another routing protocol with ……? (Choose two.)
A. UDP
B. Internal BGP
C. TCP/IP
D. EIGRP
E. OSPF
F. RIP
Answer: DE
NEW QUESTION 470
IP CEF load-sharing options ……? (Choose three.)
A. Tunnel
B. Universal
C. Include-ports
D. Source
E. Destination
Answer: ABC
NEW QUESTION 471
What is the minimum privilege level to enter all commands in usermode?
A. Level14
B. Level0
C. Level1
D. Level15
Answer: C
NEW QUESTION 472
Which two statements about password-protecting device access are true? (Choose two)
A. The more system:running-config command displays encrypted passwords in clear text.
B. The service password-encryption command forces a remote device to encrypt the password.
C. A network administrator can recover an encrypted password.
D. The privilege level command controls the commands a specific user can execute.
E. The password can be encrypted in the running configuration.
Answer: DE
NEW QUESTION 473
Frame Relay LMI autosense. Which statements are true? (Choose two.)
A. Line should be up and protocol should be down.
B. Protocol must be up.
C. It only works on DTEs.
D. It only works on DCEs.
Answer: AC
NEW QUESTION 474
……
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