Quick Guide: 400-101 ccie routing and switching pdf

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2016 Dec latest ccie r&s dumps:

Q131. DRAG DROP 

Drag and drop the router preference on the left to the correct routing sequence (from most preferred to least preferred) on the right. 

Answer: 


Q132. Which two statements about BGP loop prevention are true? (Choose two.) 

A. Advertisements from PE routers with per-neighbor SOO configured include a Site of Origin value that is equal to the configured value of the BGP peering. 

B. If the configured Site of Origin value of a BGP peering is equal to the Site of Origin value on a route it receives, route advertisement is blocked to prevent a route loop. 

C. AS-override aids BGP loop prevention, but alternate loop prevention mechanisms are also necessary. 

D. Advertisements from the neighbors a BGP peering include a Site of Origin value that is separate from the configured value of the BGP peering. 

E. If the configured Site of Origin value of a BGP peering is greater than the Site of Origin value on a route it receives, route advertisement is blocked to prevent a route loop. 

F. If the configured Site of Origin value of a BGP peering is equal to the Site of Origin value on a route it receives, route advertisement is permitted. 

Answer: A,B 


Q133. Which two operating modes does VPLS support? (Choose two.) 

A. transport mode 

B. strict mode 

C. port mode 

D. loose mode 

E. VLAN mode 

F. dynamic mode 

Answer: C,E 


Q134. Refer to the exhibit. 

Which VLANs are permitted to send frames out port FastEthernet0/1? 

A. 100 - 200 

B. 4 - 100 

C. 1 and 4 - 100 

D. 3 and 4 - 100 

Answer:

Explanation: 

Traffic on the native vlan does not get tagged as it crosses a trunk, so there is no dot1q tag in the first place to be filtered. And you don’t need to allow the native vlan. But if we force to tag the native vlan (with the “switchport trunk native vlan tag” command) then if the native vlan is not in the “allowed vlan” list it will be dropped. 


Q135. DRAG DROP 

Drag and drop the events on the left to dispaly the correct sequence on the right when CoPP is enabled. 

Answer: 


Improved 400-101 ccie written exam price:

Q136. Which three statements are true about VSS? (Choose three.) 

A. VSS separates the control planes of the active and the standby chassis. 

B. Configuration changes can be made on both active and standby chassis. 

C. When the VSS active chassis recovers after a failure, it initiates a switchover and takes on the active role again. 

D. VSS unifies the control planes of the active and the standby chassis. 

E. HSRP configuration is not required to run VSS. 

F. The VSS standby chassis monitors the VSS active chassis using the VSL. 

Answer: D,E,F 

Explanation: 

VSS operates on a unified control plane with a distributed forwarding architecture in which the active supervisor (or switch) is responsible for actively participating with the rest of the network and for managing and maintaining control plane information. VSS actually removes the need for a next-hop redundancy protocol like HSRP or VRRP. These first-hop redundancy protocols are usually heavily tied to a fast-converging routing protocol like EIGRP, and still require that each device maintain its own control plane. The standby chassis monitors the active chassis using the VSL. If it detects failure, the standby chassis initiates a switchover and takes on the active role. When the failed chassis recovers, it takes on the standby role. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-1SY/config_guide/sup2T/15_1_sy_swcg_2T/virtual_switching_systems.pdf 


Q137. Which two statements about the max-age time in IS-IS are true? (Choose two.) 

A. The IS-IS max-age time is 20 minutes by default. 

B. The IS-IS max-age time is 60 minutes by default. 

C. The IS-IS max-age time increments from zero to max-age. 

D. The IS-IS max-age time decrements from max-age to zero. 

Answer: A,D 


Q138. Which option describes how a router responds if LSA throttling is configured and it receives the identical LSA before the interval is set? 

A. The LSA is added to the OSPF database and a notification is sent to the sending router to slow down its LSA packet updates. 

B. The LSA is added to the OSPF database. 

C. The LSA is ignored. 

D. The LSA is ignored and a notification is sent to the sending router to slow down its LSA packet updates. 

Answer:

Explanation: 

How OSPF LSA Throttling Works 

The timers throttle lsa all command controls the generation (sending) of LSAs. The first LSA is always generated immediately upon an OSPF topology change, and the next LSA generated is controlled by the minimum start interval. The subsequent LSAs generated for the same LSA are rate-limited until the maximum interval is reached. The "same LSA" is defined as an LSA instance that contains the same LSA ID number, LSA type, and advertising router ID. 

The timers LSA arrival command controls the minimum interval for accepting the same LSA. If an instance of the same LSA arrives sooner than the interval that is set, the LSA is dropped. It is recommended that the arrival interval be less than or equal to the hold-time interval of the timers throttle lsa all command. 

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


Q139. Refer to the exhibit. 

Which option is the result of this configuration? 

A. Devices in OSPF area 15 can reach the summary route 192.168.0.0/16 and its more specific subnets. 

B. Devices in OSPF area 15 can reach only the more specific routes of 192.168.0.0/16. 

C. Devices in OSPF area 0 can reach the summary route 192.168.0.0/16 and its more specific subnets. 

D. Devices in OSPF area 0 can reach only the summary route of 192.168.0.0/16. 

Answer:

Explanation: 

. area range 

To consolidate and summarize routes at an area boundary, use the area range command in router configuration mode. To disable this function, use theno form of this command. Area area-id range ip-address mask [advertise | not-advertise] [cost cost] no area area-id range ip-address mask [advertise | not-advertise] [cost cost] 

. Syntax Description 

area-id 

Identifier of the area about which routes are to be summarized. It can be specified as either a decimal value or as an IP address. 

ip-address 

IP address. 

mask 

IP address mask. 

advertise 

(Optional) Sets the address range status to advertise and generates a Type 3 summary link-state advertisement (LSA). 

not-advertise 

(Optional) Sets the address range status to DoNotAdvertise. The Type 3 summary LSA is suppressed, and the component networks remain hidden from other networks. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfospf. html 


Q140. Which circumstance can cause packet loss due to a microburst? 

A. slow convergence 

B. a blocked spanning-tree port 

C. process switching 

D. insufficient buffers 

Answer:

Explanation: 

Micro-bursting is a phenomenon where rapid bursts of data packets are sent in quick succession, leading to periods of full line-rate transmission that can overflow packet buffers of the network stack, both in network endpoints and routers and switches inside the network. 

Symptoms of micro bursts will manifest in the form of ignores and/ or overruns (also shown as accumulated in “input error” counter within show interface output). This is indicative of receive ring and corresponding packet buffer being overwhelmed due to data bursts coming in over extremely short period of time (microseconds). 

Reference: http://ccieordie.com/?tag=micro-burst 


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