[Renovate] 400-101 ccie written exam number

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2016 Aug ccie pdf download:

Q31. Refer to the exhibit. 


Why is the OSPF state in 2WAY/DROTHER? 

A. This is the expected output when the interface Ethernet0/0 of R1 is configured with OSPF Priority 0. 

B. There is a duplicate router ID. 

C. There is an MTU mismatch. 

D. There is an OSPF timer (hello/dead) mismatch. 

E. This is the expected output when R1 is the DR. 

Answer: A 

Explanation: 

Sometimes it is desirable for a router to be configured so that it is not eligible to become the DR or BDR. You can do this by setting the OSPF priority to zero with the ip ospf priority priority# interface subcommand. If two OSPF neighbors both have their OSPF interface priority set to zero, they establish two-way adjacency instead of full adjacency. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13683-11.html 


Q32. Which statement about a type 4 LSA in OSPF is true? 

A. It is an LSA that is originated by an ABR, that is flooded throughout the AS, and that describes a route to the ASBR. 

B. It is an LSA that is originated by an ASBR, that is flooded throughout the AS, and that describes a route to the ASBR. 

C. It is an LSA that is originated by an ASBR, that is flooded throughout the area, and that describes a route to the ASBR. 

D. It is an LSA that is originated by an ABR, that is flooded throughout the AS, and that describes a route to the ABR. 

E. It is an LSA that is originated by an ABR, that is flooded throughout the area, and that describes a route to the ASBR. 

Answer: E 

Explanation: 

LSA Type 4 (called Summary ASBR LSA) is generated by the ABR to describe an ASBR to routers in other areas so that routers in other areas know how to get to external routes through that ASBR. 


Q33. Which statement about SSHv2 is true? 

A. Routers acting as SSH clients can operate without RSA keys. 

B. SSHv2 supports port forwarding and compression. 

C. The RSA key pair size must be at least 512. 

D. You must configure a default gateway before you enable SSHv2. 

Answer: A 


Q34. What are the three variants of NTPv4? (Choose three.) 

A. client/server 

B. broadcast 

C. symmetric 

D. multicast 

E. asymmetric 

F. unicast 

Answer: A,B,C 


Q35. Which two statements are true about a 6to4 tunnel connecting two IPv6 islands over the IPv4 Internet? (Choose two.) 

A. It embeds the IPv6 packet into the IPv4 payload with the protocol type set to 51. 

B. It works by appending the private IPv4 address (converted into hexadecimal format) to the 2002::/16 prefix. 

C. It embeds the IPv6 packet into the IPv4 payload with the protocol type set to 41. 

D. It works by appending the public IPv4 address (converted into hexadecimal format) to the 2002::/16 prefix. 

Answer: C,D 

Explanation: 

6to4 embeds an IPv6 packet in the payload portion of an IPv4 packet with protocol type 41. To send an IPv6 packet over an IPv4 network to a 6to4 destination address, an IPv4 

header with protocol type 41 is prepended to the IPv6 packet. The IPv4 destination address for the prepended packet header is derived from the IPv6 destination address of the inner packet (which is in the format of a 6to4 address), by extracting the 32 bits immediately following the IPv6 destination address's 2002::/16 prefix. The IPv4 source address in the prepended packet header is the IPv4 address of the host or router which is sending the packet over IPv4. The resulting IPv4 packet is then routed to its IPv4 destination address just like any other IPv4 packet. 

Reference: http://en.wikipedia.org/wiki/6to4 


400-101 free practice exam

Latest ccie written dumps 400-101:

Q36. DRAG DROP 

Drag and drop each STP port role on the left to the matching statement on the right. 


Answer: 



Q37. When you enable the MPLS Multi-VRF feature, which two supported routing protocols can be used to exchange routing information between PE routers and CE routers? (Choose two.) 

A. BGP 

B. RIP 

C. OSPF 

D. EIGRP 

E. IS-IS 

Answer: A,B 


Q38. Refer to the exhibit. 


Routers R1, R2, and R3 are configured as shown, and traffic from R2 fails to reach 172.29.168.3. 

Which action can you take to correct the problem? 

A. Correct the static route on R1. 

B. Correct the default route on R2. 

C. Edit the EIGRP configuration of R3 to enable auto-summary. 

D. Correct the network statement for 172.29.168.3 on R3. 

Answer: A 

Explanation: 

On R1 we see there is a wrongly configured static route: ip route 172.29.168.3 255.255.255.255 172.17.17.2. It should be ip route 172.29.168.3 255.255.255.255 10.17.12.3. 


Q39. Which three features require Cisco Express Forwarding? (Choose three.) 

A. NBAR 

B. AutoQoS 

C. fragmentation 

D. MPLS 

E. UplinkFast 

F. BackboneFast 

Answer: A,B,D 

Explanation: 

QoS Features That Require CEF 

These class-based QoS features are supported only on routers that run CEF. 

.Network Based Application Recognition (NBAR) provides intelligent network classification. For more information, refer to Network Based Application Recognition. 

. The AutoQoS -VoIP feature simplifies and speeds up the implementation and provisioning of QoS for VoIP traffic. This feature is enabled with the help of the auto qos voip command. CEF must be enabled at the interface or ATM PVC before the auto qos command can be used. For more information about this feature and its prerequisites, refer to AutoQoS -VoIP. 

From MPLS Fundamentals - Luc De Ghein 

Why Is CEF Needed in MPLS Networks? 

Concerning MPLS, CEF is special for a certain reason; otherwise, this book would not explicitly cover it. Labeled packets that enter the router are switched according to the label forwarding information base (LFIB) on the router. IP packets that enter the router are switched according to the CEF table on the router. Regardless of whether the packet is switched according to the LFIB or the CEF table, the outgoing packet can be a labeled packet or an IP packet 

Reference: http://www.cisco.com/c/en/us/support/docs/asynchronous-transfer-mode-atm/ip-to-atm-class-of-service/4800-cefreq.html 


Q40. Which three statements about EIGRP and BFD are true? (Choose three.) 

A. BFD is independent of the routing protocol, so it can be used as a generic failure detection mechanism for EIGRP. 

B. Some parts of BFD can be distributed to the data plane, so it can be less CPU-intensive than reduced timers, which exist wholly at the control plane. 

C. Reduced EIGRP timers have an absolute minimum detection timer of 1-2 seconds; BFD can provide sub-second failure detection. 

D. BFD is tied to specific routing protocols and can be used for generic fault detection for the OSPF, EIGRP, and BGP routing protocols. 

E. BFD is dependent on the EIGRP routing protocol, so it can be used as a specific failure detection mechanism. 

F. BFD resides on the control plane, so it is less CPU-intensive than if it resided on the data plane. 

Answer: A,B,C 

Explanation: 

There are several advantages to implementing BFD over reduced timer mechanisms for routing protocols: 

. Although reducing the EIGRP, IS-IS, and OSPF timers can result in minimum detection timer of one to two seconds, BFD can provide failure detection in less than one second. 

. Because BFD is not tied to any particular routing protocol, it can be used as a generic and consistent failure detection mechanism for EIGRP, IS-IS, and OSPF. 

. Because some parts of BFD can be distributed to the data plane, it can be less CPU-intensive than the reduced EIGRP, IS-IS, and OSPF timers, which exist wholly at the control plane. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fs_bfd.html 


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