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2021 Nov ccie dumps 400-101:

Q341. Which two OSPF network types require the use of a DR and BDR? (Choose two.) 

A. non-broadcast networks 

B. point-to-point networks 

C. point-to-multipoint networks 

D. broadcast networks 

E. point-to-multipoint non-broadcast networks 

Answer: A,D 


Q342. Which switching technology can be used to solve reliability problems in a switched network? 

A. fragment-free mode 

B. cut-through mode 

C. check mode 

D. store-and-forward mode 

Answer: D 

Explanation: 

Characteristics of Store-and-Forward Ethernet Switching 

This section provides an overview of the functions and features of store-and-forward Ethernet switches. 

Error Checking 

Figure 1 shows a store-and-forward switch receiving an Ethernet frame in its entirety. At the end of that frame, the switch will compare the last field of the datagram against its own frame-check-sequence (FCS) calculations, to help ensure that the packet is free of physical and data-link errors. The switch then performs the forwarding process. Whereas a store-and-forward switch solves reliability issues by dropping invalid packets, cut-through devices forward them because they do not get a chance to evaluate the FCS before transmitting the packet. 

Figure 1. Ethernet Frame Entering a Store-and-Forward Bridge or Switch (from Left to Right) 

Reference: http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5020-switch/white_paper_c11-465436.html 


Q343. Which two statements about the passive-interface command are true? (Choose two.) 

A. A RIP router listens to multicast updates from its neighbor but stops sending multicast updates on the passive interface. 

B. In OSPF, configuring passive-interface at the interface level suppresses hello packets for the interface and all sub interfaces. 

C. An EIGRP router can form neighbor relationship on the passive interface, but incoming and outgoing multicast updates are disabled on the interface. 

D. A RIP router disables all incoming and outgoing multicast updates in the passive interface. 

E. In EIGRP, the passive interface stops sending hello packets. 

F. In OSPF, the passive interface can receive incoming routing updates and update the device routing table. 

Answer: A,E 


Q344. Refer to the exhibit. 

When the link between RtrB and RtrC goes down, multicast receivers stop receiving traffic from the source for multicast group 229.1.1.1.Which solution will resolve this? 

A. adding a static mroute on RtrB and RtrF 

B. adding a static unicast route on RtrB and RtrF 

C. creating a GRE tunnel between RtrB and RtrD 

D. enabling PIM sparse mode on both ends of the link between RtrB and RtrF 

Answer: D 

Explanation: 

For multicast traffic to flow, PIM must be enabled on all routers in the path of the multicast stream. 


Q345. What are two reasons to define static peers in EIGRP? (Choose two.) 

A. Security requirements do not allow dynamic learning of neighbors. 

B. The link between peers requires multicast packets. 

C. Back-level peers require static definition for successful connection. 

D. The link between peers requires unicast packets. 

Answer: A,D 

Explanation: 

There are two ways we can create EIGRP neighbor relationship: 

+ Use “network ” command. This is the more popular way to create EIGRP neighbor relationship. That router will check which interfaces whose IP addresses belong to the and turn EIGRP on that interface. EIGRP messages are sent via multicast packets. 

+ Use “neighbor” commanD. The interface(s) that have this command applied no longer send or receive EIGRP multicast packets. EIGRP messages are sent via unicast. The router only accepts EIGRP packets from peers that are explicitly configured with a neighbor statement. Consequently, any messages coming from routers without a corresponding neighbor statement are discarded. This helps prevent the insertion of unauthorized routing peers -> A and D are correct. 


Improve ccie dumps 400-101:

Q346. Refer to the exhibit. 

Which two corrective actions could you take if EIGRP routes from R2 fail to reach R1? (Choose two.) 

A. Configure R2 to use a VRF to send routes to R1. 

B. Configure the autonomous system in the EIGRP configuration of R1. 

C. Correct the network statement on R2. 

D. Add the interface on R1 that is connected to R2 into a VRF. 

Answer: B,D 

Explanation: 

In this question we are running VRF Lite on R1. VRF Lite is also knows as “VRF without 

running MPLS”. This is an example of how to configure VRF Lite with EIGRP: 

ip vrf FIRST 

rd 1:1 

! 

ip vrf SECOND 

rd 1:2 

! 

router eigrp 1 

no auto-summary 

! 

address-family ipv4 vrf FIRST 

network 10.1.1.1 0.0.0.0 

no auto-summary 

autonomous-system 200 

exit-address-family 

! 

address-family ipv4 vrf SECOND 

network 10.1.2.1 0.0.0.0 

no auto-summary 

autonomous-system 100 

exit-address-family 

! 

interface FastEthernet0/0 

ip vrf forwarding FIRST 

ip address 10.1.1.1 255.255.255.0 

! 

interface FastEthernet0/1 

ip vrf forwarding SECOND 

ip address 10.1.2.1 255.255.255.0 

The above example creates two VRFs (named “FIRST” and “SECOND”). VRF “FIRST” runs on EIGRP AS 200 while VRF “SECOND” runs on EIGRP AS 100. After that we have to add interfaces to the appropriate VRFs. From this example, back to our question we can see that R1 is missing the “autonomous-system …” command under “address-family ipv4 vrf R2. And R1 needs an interface configured under that VRF. 

Note. R2 does not run VRF at all! Usually R2 resides on customer side. 


Q347. Which option describes a limitation of Embedded Packet Capture? 

A. It can capture data only on physical interfaces and subinterfaces. 

B. It can store only packet data. 

C. It can capture multicast packets only on ingress. 

D. It can capture multicast packets only on egress. 

Answer: C 

Explanation: 

Restrictions for Embedded Packet Capture 

. In Cisco IOS Release 12.2(33)SRE, EPC is supported only on 7200 platform. 

. EPC only captures multicast packets on ingress and does not capture the replicated packets on egress. 

. Currently, the capture file can only be exported off the device; for example, TFTP or FTP servers and local disk. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/epc/configuration/15-mt/epc-15-mt-book/nm-packet-capture.html 


Q348. Which IP SLA operation type uses IP to measure the round-trip time between a router and a device? 

A. HTTP 

B. ICMP Echo 

C. ICMP Path Jitter 

D. UDP Jitter for VoIP 

Answer: B 


Q349. What is the goal of Unicast Reverse Path Forwarding? 

A. to verify the reachability of the destination address in forwarded packets 

B. to help control network congestion 

C. to verify the reachability of the destination address in multicast packets 

D. to verify the reachability of the source address in forwarded packets 

Answer: D 

Explanation: 

Network administrators can use Unicast Reverse Path Forwarding (Unicast RPF) to help limit the malicious traffic on an enterprise network. This security feature works by enabling a router to verify the reachability of the source address in packets being forwarded. This capability can limit the appearance of spoofed addresses on a network. If the source IP address is not valid, the packet is discarded. 

Reference: http://www.cisco.com/web/about/security/intelligence/unicast-rpf.html 


Q350. Which statement about the spanning-tree portfast feature on the switch is true? 

A. If an interface is enabled for portfast receives BDPU, the port goes through the spanning-tree listening, learning, and forwarding states. 

B. If an interface is enabled for portfast receives BDPU, the port does not go through the spanning-tree listening, learning, and forwarding states. 

C. If an interface is enabled for portfast receives BDPU, the port is shut down immediately. 

D. If an interface is enabled for portfast receives BDPU, the port goes into the spanning-tree inconsistent state. 

Answer: A