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2021 Nov ccie written exam:

Q351. Which technology is not necessary to set up a basic MPLS domain? 

A. IP addressing 

B. an IGP 

C. LDP or TDP 

D. CEF 

E. a VRF 

Answer:

Explanation: 

The simplest form of VRF implementation is VRF Lite. In this implementation, each router within the network participates in the virtual routing environment in a peer-based fashion. While simple to deploy and appropriate for small to medium enterprises and shared data centres, VRF Lite does not scale to the size required by global enterprises or large carriers, as there is the need to implement each VRF instance on every router, including intermediate routers. VRFs were initially introduced in combination with MPLS, but VRF proved to be so useful that it eventually evolved to live independent of MPLS. This is the historical explanation of the term VRF Lite. Usage of VRFs without MPLS. 

Reference: http://en.wikipedia.org/wiki/Virtual_routing_and_forwarding 


Q352. In which two situations is an EIGRP hello packet sent as unicast? (Choose two.) 

A. during neighbor discovery 

B. when link costs change 

C. when the neighbor command is used 

D. when an ACK is sent 

Answer: C,D 


Q353. Refer to the exhibit. 

Which two statements about the VPN solution are true? (Choose two.) 

A. Customer A and customer B will exchange routes with each other. 

B. R3 will advertise routes received from R1 to R2. 

C. Customer C will communicate with customer A and B. 

D. Communication between sites in VPN1 and VPN2 will be blocked. 

E. R1 and R2 will receive VPN routes advertised by R3. 

Answer: C,E 

Explanation: 

+ VPN1 exports 10:1 while VPN3 imports 10:1 so VPN3 can learn routes of VPN1. 

+ VNP1 imports 10:1 while VNP3 export 10:1 so VNP1 can learn routes of VPN3. 

-> Customer A can communicate with Customer C 

+ VPN2 exports 20:1 while VPN3 imports 20:1 so VPN3 can learn routes of VPN2. 

+ VPN2 imports 20:1 while VPN3 exports 20:1 so VPN2 can learn routes of VPN3. 

-> Customer B can communicate with Customer C 

Therefore answer C is correct. 

Also answer E is correct because R1 & R2 import R3 routes. 

Answer A is not correct because Customer A & Customer B do not import routes which are exported by other router. Customer A & B can only see Customer C. 

Answer B is not correct because a router never exports what it has learned through importation. It only exports its own routes. 

Answer D is correct because two VPN1 and VPN2 cannot see each other. Maybe in this question there are three correct answers. 


Q354. Which two statements about IOS and IOS XE are true? (Choose two.) 

A. IOS XE can upgrade and restart applications independently of IOS. 

B. Only IOS uses the FFM to provide separation between the control plane and the data plane. 

C. IOS XE provides improved functionality and an enhanced UI. 

D. Only IOS runs as a single daemon within the Linux OS. 

E. IOS XE provides additional system functions that run as multiple separate processes in the OS. 

Answer: A,E 


Q355. Refer to the exhibit. 

The spokes of the DMVPN with the given configuration are having QoS issues. 

Which two actions can you take to resolve the problem? (Choose two.) 

A. Configure qos pre-classify on the tunnel interface. 

B. Configure an NHRP group on the tunnel interface and associate it to a QoS policy. 

C. Modify the configuration of the IPsec policy to accept QoS policies. 

D. Manually configure a QoS policy on the serial interface. 

E. Configure the bandwidth statement on the tunnel interface. 

F. Configure the bandwidth statement on the serial interface. 

Answer: A,B 

Explanation: 

It is possible to classify based on information that is encrypted, which is needed in this example. You can use an access-list, configured to match the private subnet behind the remote spoke. The qos pre-classify command is used on the tunnel interface, and is required because the traffic is classified by a parameter that is encrypted as the traffic leaves the physical outbound interface. L4 information from the IP data packet can also classify traffic destined to the same private subnet. The “nhrp map group group-name service-policy output parent-policy-name” command adds the NHRP group to the QoS policy map on the hub. 


Improve 400-101 ccie written exam number:

Q356. Refer to the exhibit. 

R1 is configured as shown. R1 is able to establish a neighbor adjacency only with R2. Which addition must you make to the R1 configuration to allow it to establish an adjacency with R3? 

A. interface gigabitethernet 0/1 

ip address 10.1.0.1 255.255.255.0 

ip ospf network point-to-point 

B. interface gigabitethernet 0/1 

ip address 10.1.0.1 255.255.255.0 

ip ospf 1 area 0 

C. router ospf 1 

network 10.1.0.0 0.0.0.255 area 1 

D. router ospf 1 

area 0 stub 

Answer:

Explanation: 

To enable interfaces and networks with OSPF, the networks need to be specified in the network statement. In the configuration shown, only 10.0.0.0/24 has been enabled, we are missing the network connecting to R3 (10.1.0.0/24). 


Q357. Which option describes the purpose of the leak-map keyword in the command eigrp stub connected leak-map EigrpLeak? 

A. It allows the specified static routes to be advertised. 

B. It allows exceptions to the route summarization that is configured. 

C. It allows specified EIGRP-learned routes to be advertised. 

D. It restricts specified connected routes from being advertised. 

Answer:

Explanation: 

ExamplE. eigrp stub leak-map Command 

In the following example, the eigrp stub command is issued with the leak-map name keyword-argument pair to configure the device to reference a leak map that identifies routes to be advertised that would have been suppressed otherwisE. 

Device(config)# router eigrp 1 

Device(config-router)# network 10.0.0.0 

Device(config-router)# eigrp stub leak-map map1 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-mt/ire-15-mt-book/ire-eigrp-stub-rtg.html#GUID-FB899CA9-E9DE-48D8-8048-C971179E4E24 


Q358. Refer to the exhibit. 

Which statement is true? 

A. It is impossible for the destination interface to equal the source interface. 

B. NAT on a stick is performed on interface Et0/0. 

C. There is a potential routing loop. 

D. This output represents a UDP flow or a TCP flow. 

Answer:

Explanation: 

In this example we see that the source interface and destination interface are the same (Et0/0). Typically this is seen when there is a routing loop for the destination IP address. 


Q359. Refer to the exhibit. 

Which statement about configuring the switch to manage traffic is true? 

A. The switchport priority extend cos command on interface FastEthernet0/0 prevents traffic to and from the PC from taking advantage of the high-priority data queue that is assigned to the IP phone. 

B. The switchport priority extend cos command on interface FastEthernet0/0 enables traffic to and from the PC to use the high priority data queue that is assigned to the IP phone. 

C. When the switch is configured to trust the CoS label of incoming traffic, the trusted boundary feature is disabled automatically. 

D. The mls qos cos override command on interface FastEthernet0/0 configures the port to trust the CoS label of traffic to and from the PC. 

Answer:

Explanation: 

In some situations, you can prevent a PC connected to the Cisco IP Phone from taking advantage of a high-priority data queue. You can use the switchport priority extend cos interface configuration command to configure the telephone through the switch CLI to override the priority of the traffic received from the PC. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2950/software/release/12-1_22_ea2/configuration/guide/2950scg/swqos.html 


Q360. Where is multicast traffic sent, when it is originated from a spoke site in a DMVPN phase 2 cloud? 

A. spoke-spoke 

B. nowhere, because multicast does not work over DMVPN 

C. spoke-spoke and spoke-hub 

D. spoke-hub 

Answer:

Explanation: 

Spokes map multicasts to the static NBMA IP address of the hub, but hub maps multicast packets to the “dynamic” mappings – that is, the hub replicates multicast packets to all spokes registered via NHRP, so multicast traffic is sent to the hub from a spoke instead of to the other spokes directly.