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Question 1:
Refer to the exhibit
A network engineer is troubleshooting an AAA authentication issue for R1 from R2 When an engineer tries to open a telnet connection to R1 it opens the connection but shows a %Authorization failed error message on the terminal and closes the connection silently Which action resolves the issue?
A. Resolve tacacs+ server host IP authentication miss configuration on the R1 router
B. Resolve tacacs+ server reachability from the R1 router.
C. Configure the tacacs+ server host IP on the R1 router
D. Configure authorization commands in the tactics* server for the R1 router.
Correct Answer: D
Question 2:
Refer to the exhibit.
A network administrator configured an IPv6 access list to allow TCP return traffic only, but it is not working as expected. Which changes resolve this issue?
A. ipv6 access-list inbound permit tcp any syn deny ipv6 any log! interface gi0/0 ipv6 traffic-filter inbound out
B. ipv6 access-list inbound permit tcp any syn deny ipv6 any log! interface gi0/0 ipv6 traffic-filter inbound in
C. ipv6 access-list inbound permit tcp any established deny ipv6 any log! interface gi0/0 ipv6 traffic-filter inbound in
D. ipv6 access-list inbound permit tcp any established deny ipv6 any log! interface gi0/0 ipv6 traffic-filter inbound out
Correct Answer: C
Question 3:
Refer to the exhibit. The administrator successfully logs into R1 but cannot access privileged mode commands. What should be configured to resolve the issue?
A. aaa authorization reverse-access
B. secret Cisco 123! at the end of the username command instead of password cisco123!
C. matching password on vty lines as cisco123!
D. enable secret or enable password commands to enter into privileged mode
Correct Answer: D
Question 4:
What is the total length of an MPLS header?
A. 16 bits
B. 20 bits
C. 28 bits
D. 32 bits
Correct Answer: D
Question 5:
What are the two prerequisites to enable BFD on Cisco routers? (Choose two)
A. A supported IP routing protocol must be configured on the participating routers.
B. OSPF Demand Circuit must run BFD on all participating routers.
C. ICMP must be allowed on all participating routers.
D. UDP port 1985 must be allowed on all participating routers.
E. Cisco Express Forwarding and IP Routing must be enabled on all participating routers.
Correct Answer: CE
Question 6:
There is an issue between two nodes within your network, and you are using Cisco DNA Center Path Trace to help troubleshoot the problem. Which of the following statements are true regarding the Path Trace tool?
A. Overlapping IP addresses are supported.
B. Path trace between a fabric client and a non-fabric client is supported
C. Path trace between a wired client and a wireless client is supported
D. Only TCP traffic is supported.
Correct Answer: C
Question 7:
What must be configured by the network engineer to circumvent the AS_PATH loop prevention mechanism in IP/VPN Hub and Spoke deployment scenarios?
A. Use as-override at the PE_Hub.
B. Use allows-in and as-override at all PEs.
C. Use allows-in and as-override at the PE_Hub.
D. Use allows-in at the PE_Hub.
Correct Answer: A
Question 8:
Refer to the exhibit.
An engineer configured two ASBRs, 10.4.17.6 and 10.4.15.5, in an OSPF network to redistribute identical routes from BGR However, only prefixes from 10.4.17.6 are installed into the routing table on R1. Which action must the engineer take to achieve load sharing for the BGP-originated prefixes?
A. The ASBRs are advertising the redistributed prefixes with the iBGP metric and must be modified to Type 1 on ASBR 10.4.17.6.
B. The ASBRs are advertising the redistributed prefixes with a different admin distance and must be changed to 110 on ASBR 10.4.15.5.
C. The admin distance of the prefixes must be adjusted to 20 on ASBR 10.4.15.5 to advertise prefixes to R1 identically from both ASBRs.
D. The ASBRs are advertising the redistributed prefixes as Type 1 and must be modified to Type 2
Correct Answer: D
Question 9:
Two MPLS routers, R1 and R2, are not directly connected and have an established LDP session running between them. What type of LDP session is this?
A. Remote LDP session
B. Direct LDP session
C. Tunneled LDP session
D. Targeted LDP session
Correct Answer: D
Question 10:
The exhibit contains portions of RouterA\’s BGP configuration and IP routing table.
Which IP network addresses, that were not learned using BGP, will be present in BGP advertisements from RouterA?
A. 172.16.0.0/16
B. 172.16.16.0/24
C. 172.16.24.0/20
D. No IGP networks will be advertised because synchronization is disabled.
Correct Answer: A
The auto-summary command can affect which networks, identified by using the network command, will be advertised. Using the existing BGP configuration, the router will not announce the 172.16.16.0/24 subnet.
Instead, it will announce the classful address 172.16.0.0/16 when the IP routing table maintained by the IGP contains any subnet of that classful address.
The network command directly affects what network is advertised in BGP. If the network command does not also include a network mask, and if auto-summary is enabled, the classful address of 172.16.0.0/16 is advertised any time that the router learns about a 172.16.0.0 subnet via its Interior Gateway Protocol (IGP), such as OSPF or EIGRP.
In the exhibit, the routing table does contain entries of the 172.16.16.0/24 and 172.16.24.0/24 subnets that were learned by using the IGP.
If auto-summary is disabled by using the no auto-summary command, only networks in the routing table that are exactly matched to the network commands are advertised. For example, to have the router announce only the 172.16.16.0/24 subnet learned via its IGP, you should alter the network command\’s IP address and include the subnet mask as follows:
network 172.16.16.0 mask 255.255.255.0
A combination of network statements and route statements can be used to advertise a subset of networks that exist. Examine the output shown below:
router bgp 68410
network 192.168.24.0 255.255.252.0
neighbor 172.16.8.5 remote-as 68441
ip route 192.168.24.0 255.255.252.0 null 0
The router is configured to advertise a summary route to the network 192.168.24.0 255.255.252.0. Consider the following networks:
192.168.24.0/24
192.168.25.0/24
192.168.26.0/24
192.168.32.0/24
If this router was connected to those networks, and received a packet destined for 192.168.25.1, it would successfully route the packet because the summary address (where the summarization is the result of the mask 255.255.252.0) is designed to include all of the subnets above except for 192.168.32.0/24.
Therefore, all subnets except 192.168.32.0/24 will be advertised by the network and IP route statements with the summary mask.
Note: Whenever changes are made to a routing policy or to an access list that is used by a routing policy, the change will not be reflected in the routing tables of the receiving routers until the BGP session has been cleared with the clear ip bgp command.
The BGP synchronization rule specifies that networks will not be advertised or used via iBGP unless it also has been learned through an IGP.
If synchronization is disabled, iBGP will advertise a network without also learning it through an IGP.
Objective:
Layer 3 Technologies
Sub-Objective:
Configure and verify eBGP (IPv4 and IPv6 address families)
References:
Cisco IOS Master Command List > a through b > BGP Commands: A through B > auto-summary (BGP) Cisco > Cisco IOS IP Routing: BGP Command Reference > router bgp Cisco > Cisco IOS IP Routing: BGP Command Reference >
network (BGP and multiprotocol BGP)
Question 11:
Which dialer interface command sets the maximum size of IP packets to 1492?
A. router(config-if)# mtu 1492
B. router(config-if)# ip PPP 1492
C. router(config-if)# ip 1492
D. router(config-if)# ip mtu 1492
Correct Answer: D
The correct interface command to set the maximum size of IP packets (maximum transmission unit or MTU size) to 1492 is router(config-if)# ip mtu 1492. This command is required because RFC 2516 states the maximum receive unit (MRU) must not be negotiated larger than 1492 bytes.
All other answers are invalid commands due to incorrect syntax.
Objective:
Network Principles
Sub-Objective:
Explain TCP operations
References:
Cisco > Cisco IOS IP Application Services Command Reference > idle (firewall farm datagram protocol) through ip slb nat pool > ip mtu
Question 12:
Refer to the exhibit. What does the imp-null tag represent in the MPLS VPN cloud?
A. Pop the label
B. Impose the label
C. Include the EXP bit
D. Exclude the EXP bit
Correct Answer: A
The imp-null (implicit null) tag instructs the upstream router to pop the tag entry off the tag stack before forwarding the packet. Note: pop means to remove the top MPLS label
Question 13:
DRAG DROP Refer to the exhibit.
Drag and drop the credentials from the left onto the remote login information on the right to resolve a failed login attempt to vtys. Not all credentials are used.
Select and Place:
Correct Answer:
vty 0:
+
cisco
+
0csic
vty 1:
+
no username
+
no password
The command “aaa authentication login default none” means no authentication is required when access to the device via Console/VTY/AUX so if one interface does not specify another login authentication method (via the “login authentication …” command), it will allow to access without requiring username or password.
In this case, VTY 1 does not specify another authentication login method so it will use the default method (which is “none” in this case).
Question 14:
Which control plane process allows the MPLS forwarding state to recover when a secondary RP takes over from a failed primary RP?
A. MP-BGP uses control plane services for label prefix bindings in the MPLS forwarding table
B. LSP uses NSF to recover from disruption *I control plane service
C. FEC uses a control plane service to distribute information between primary and secondary processors
D. LDP uses SSO to recover from disruption in the control plane service
Correct Answer: C
Question 15:
Refer to the exhibit.
Which action limits the access to R2 from 192.168.12.1?
A. Swap sequence 10 with sequence 20 in access list 100.
B. Modify sequence 20 to permit tcp host 192.168.12.1 eq 22 any to access list 100
C. Swap sequence 20 with sequence 10 in access list 100
D. Modify sequence 10 to deny tcp any eq 22 any to access list 100.
Correct Answer: C
…
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