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2016 Oct ccie pdf download:

Q231. DRAG DROP 

Drag and drop the NHRP flag on the left to the corresponding meaning on the right. 

Answer: 


Q232. Refer to the exhibit. 

Assuming that the peer is configured correctly and the interface is up, how many neighbors will be seen in the EIGRPv6 neighbor table on this IPv6-only router? 

A. one neighbor, which will use a local router-id of 6010. AB8. . /64 

B. one neighbor, which will use a local router-id of 6020. AB8. . /64 

C. none, because EIGRPv6 only supports authenticated peers 

D. none, because of the mismatch of timers 

E. none, because there is no EIGRP router ID configured 

Answer:

Explanation: 

Configuring EIGRP for IPv6 has some restrictions; they are listed below: 

. The interfaces can be directly configured with EIGRP for IPv6, without the use of a global IPv6 address. There is no network statement in EIGRP for IPv6. 

. The router ID needs to be configured for an EIGRPv6 protocol instance before it can run. 

. EIGRP for IPv6 has a shutdown feature. Ensure that the routing process is in "no shut" mode to start running the protocol. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-routing-protocol-eigrp/113267-eigrp-ipv6-00.html 


Q233. Refer to the exhibit. 

All switches are Cisco switches. Assume that Cisco Discovery Protocol is enabled only on switches A and C. 

Which information is returned when you issue the command show cdp neighbors on switch C? 

A. a limited amount of information about switch B 

B. no neighbor details will be returned 

C. neighbor details for switch B 

D. neighbor details for switch A 

E. neighbor details for switch C 

Answer:

Explanation: 

CDP is used to discover information on directly connected neighbors only, so in this case SwitchC would only be able to obtain CDP information from SwitchB. However, since SwitchB is not running CDP then no neighbor information will be seen on SwitchC. Same goes for Switch A also in this topology. 


Q234. Refer to the exhibit. 

Your network is suffering excessive output drops. Which two actions can you take to resolve the problem? (Choose two.) 

A. Install a switch with larger buffers. 

B. Configure a different queue set. 

C. Reconfigure the switch buffers. 

D. Configure the server application to use TCP. 

E. Update the server operating system. 

Answer: A,B 

Explanation: 

Installing a switch with larger buffers and correctly configuring the buffers can solve output queue problems. 

For each queue we need to configure the assigned buffers. The buffer is like the ‘storage’ space for the interface and we have to divide it among the different queues. This is how to do it: 

mls qos queue-set output <queue set> buffers Q1 Q2 Q3 Q4 

In this example, there is nothing hitting queue 2 or queue 3 so they are not being utilized. 


Q235. 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:


Up to the immediate present ccie dumps 400-101:

Q236. Which algorithm heavily influenced the algorithm used by path-vector protocols? 

A. Bellman-Ford 

B. SPF 

C. DUAL 

D. Spanning-Tree 

E. Adaptive 

F. Deflection 

Answer:

Explanation: 

A path vector protocol is a computer network routing protocol which maintains the path information that gets updated dynamically. Updates which have looped through the network and returned to the same node are easily detected and discarded. This algorithm is sometimes used in Bellman–Ford routing algorithms to avoid "Count to Infinity" problems. 

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


Q237. Which TCP feature allows a client to request a specific packet that was lost? 

A. flow control 

B. sliding window 

C. fast recovery 

D. selective acknowledgment 

Answer:

Explanation: 

. TCP Selective Acknowledgment 

The TCP Selective Acknowledgment feature improves performance if multiple packets are lost from one TCP window of data. Prior to this feature, because of limited information available from cumulative acknowledgments, a TCP sender could learn about only one lost packet per-round-trip time. An aggressive sender could choose to resend packets early, but such re-sent segments might have already been successfully received. The TCP selective acknowledgment mechanism helps improve performance. The receiving TCP host returns selective acknowledgment packets to the sender, informing the sender of data that has been received. In other words, the receiver can acknowledge packets received out of order. The sender can then resend only missing data segments (instead of everything since the first missing packet). Prior to selective acknowledgment, if TCP lost packets 4 and 7 out of an 8-packet window, TCP would receive acknowledgment of only packets 1, 2, and 3. Packets 4 through 8 would need to be re-sent. With selective acknowledgment, TCP receives acknowledgment of packets 1, 2, 3, 5, 6, and 8. Only packets 4 and 7 must be re-sent. TCP selective acknowledgment is used only when multiple packets are dropped within one TCP window. There is no performance impact when the feature is enabled but not used. Use the ip tcp selective-ack command in global configuration mode to enable TCP selective acknowledgment. 

Refer to RFC 2018 for more details about TCP selective acknowledgment. 


Q238. Which two statements about redistribution are true? (Choose two.) 

A. EIGRP requires the route to have a default metric defined. 

B. EIGRP and OSPF use their router IDs to prevent loops. 

C. When OSPF is redistributed into IS-IS, the default metric must be configured under the IS-IS process. 

D. When traffic is redistributed into OSPF, the subnets command is needed to redistribute classful subnets. 

E. The default seed metric for OSPF redistributed routes is 30. 

Answer: A,B 


Q239. Refer to the exhibit. 

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

A. The PPP multilink protocol header is omitted on delay-sensitive packets. 

B. The maximum number of fragments is 1. 

C. Small real-time packets are multilink-encapsulated. 

D. A transmit queue is provided for smaller packets. 

Answer: A,D 

Explanation: 

Previous implementations of Cisco IOS Multilink PPP (MLP) include support for Link Fragmentation Interleaving (LFI). This feature allows the delivery of delay-sensitive packets, such as the packets of a Voice call, to be expedited by omitting the PPP Multilink Protocol header and sending the packets as raw PPP packets in between the fragments of larger data packets. This feature works well on bundles consisting of a single link. However, when the bundle contains multiple links there is no way to keep the interleaved packets in sequence with respect to each other. The Multiclass Multilink PPP (MCMP) feature in Cisco IOS Release 12.2(13)T addresses the limitations of MLP LFI on bundles containing multiple links by introducing multiple data classes. With multiclass multilink PPP interleaving, large packets can be multilink-encapsulated and fragmented into smaller packets to satisfy the delay requirements of real-time voice traffic; small real-time packets, which are not multilink encapsulated, are transmitted between fragments of the large packets. The interleaving feature also provides a special transmit queue for the smaller, delay-sensitive packets, enabling them to be transmitted earlier than other flows. Interleaving provides the delay bounds for delay-sensitive voice packets on a slow link that is used for other best-effort traffic. 

References: http://www.cisco.com/c/en/us/td/docs/ios/dial/configuration/guide/12_4t/dia_12_4t_book/dia _multiclass_link_ppp.pdf http://www.cisco.com/c/en/us/td/docs/routers/access/500/520/software/configuration/guide/520_SCG_Book/520scg_concepts.html 


Q240. Which three statements about RIP timers are true? (Choose three.) 

A. The default update timer is 30 seconds. 

B. The default invalid timer is 180 seconds. 

C. The default holddown timer is 180 seconds. 

D. The default flush timer is 60 seconds. 

E. The default scan timer is 60 seconds. 

F. The default hello timer is 5 seconds. 

Answer: A,B,C 

Explanation: 

The routing information protocol uses the following timers as part of its operation: 

Update Timer 

Invalid Timer 

Flush Timer 

Holddown Timer 

Update Timer 

The update timer controls the interval between two gratuitous Response Message. By default the value is 30 seconds. The response message is broadcast to all its RIP enabled interface. 

Invalid Timer 

The invalid timer specifies how long a routing entry can be in the routing table without being updated. This is also called as expiration Timer. By default, the value is 180 seconds. After the timer expires the hop count of the routing entry will be set to 16, marking the destination as unreachable. 

Flush Timer 

The flush timer controls the time between the route is invalidated or marked as unreachable and removal of entry from the routing table. By default the value is 240 seconds. This is 60 seconds longer than Invalid timer. So for 60 seconds the router will be advertising about this unreachable route to all its neighbors. This timer must be set to a higher value than the invalid timer. 

Hold-down Timer 

The hold-down timer is started per route entry, when the hop count is changing from lower value to higher value. This allows the route to get stabilized. During this time no update can be done to that routing entry. This is not part of the RFC 1058. This is Cisco's implementation. The default value of this timer is 180 seconds. 

Reference: http://en.wikipedia.org/wiki/Routing_Information_Protocol#Timers 


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