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Exam Code: 400-101
Exam Name: CCIE Routing and Switching (v5.0)
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Q371. Which map is locally defined?
Q372. Refer to the exhibit.
Which statement is true about a VPNv4 prefix that is present in the routing table of vrf one and is advertised from this router?
A. The prefix is advertised only with route target 100:1.
B. The prefix is advertised with route targets 100:1 and 100:2.
C. The prefix is advertised only with route target 100:3.
D. The prefix is not advertised.
E. The prefix is advertised with route targets 100:1, 100:2, and 100:3.
The route target used for prefix advertisements to other routers is defined on the route-target export command, which shows 100:1 in this case for VPNv4 routes.
Q373. Which two options are reasons for TCP starvation? (Choose two.)
A. The use of tail drop
B. The use of WRED
C. Mixing TCP and UDP traffic in the same traffic class
D. The use of TCP congestion control
It is a general best practice to not mix TCP-based traffic with UDP-based traffic (especially Streaming-Video) within a single service-provider class because of the behaviors of these protocols during periods of congestion. Specifically, TCP transmitters throttle back flows when drops are detected. Although some UDP applications have application-level windowing, flow control, and retransmission capabilities, most UDP transmitters are completely oblivious to drops and, thus, never lower transmission rates because of dropping. When TCP flows are combined with UDP flows within a single service-provider class and the class experiences congestion, TCP flows continually lower their transmission rates, potentially giving up their bandwidth to UDP flows that are oblivious to drops. This effect is called TCP starvation/UDP dominance. TCP starvation/UDP dominance likely occurs if (TCP-based) Mission-Critical Data is assigned to the same service-provider class as (UDP-based) Streaming-Video and the class experiences sustained congestion. Even if WRED or other TCP congestion control mechanisms are enabled on the service-provider class, the same behavior would be observed because WRED (for the most part) manages congestion only on TCP-based flows.
Reference: http://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/WAN_and_MAN/QoS_SRND/Qo S-SRND-Book/VPNQoS.html
Q374. An NSSA area has two ABRs connected to Area 0. Which statement is true?
A. Both ABRs translate Type-7 LSAs to Type-5 LSAs.
B. The ABR with the highest router ID translates Type-7 LSAs to Type-5 LSAs.
C. Both ABRs forward Type-5 LSAs from the NSSA area to backbone area.
D. No LSA translation is needed.
Q375. Refer to the exhibit.
R1 is performing mutual redistribution, but OSPF routes from R3 are unable to reach R2. Which three options are possible reasons for this behavior? (Choose three.)
A. R1 requires a seed metric to redistribute RIP.
B. The RIP version supports only classful subnet masks.
C. R1 is filtering OSPF routes when redistributing into RIP.
D. R3 and R1 have the same router ID.
E. R1 and R3 have an MTU mismatch.
F. R2 is configured to offset OSPF routes with a metric of 16.
A. RIP requires a seed metric to be specified when redistributing routes into that protocol. A seed metric is a "starter metric" that gives the RIP process a metric it can work with. The OSPF metric of cost is incomprehensible to RIP, since RIP's sole metric is hop count. We've got to give RIP a metric it understands when redistributing routes into that protocol, so let's go back to R1 and do so.
C. Filtering routes is another explanation, if the routes to R2 are boing filtered from being advertised to R1.
F. If the metric is offset to 16, then the routes will have reached the maximum hop count when redistributed to RIP. The max hop count for RIP is 16.
Q376. Which attribute is transported over an MPLS VPN as a BGP extended community?
A. route target
B. route distinguisher
E. local preference
Q377. Which regular expression will match prefixes from the AS 200 that is directly connected to our AS?
Commonly Used Regular Expressions
Locally originated routes
Learned from autonomous system 100
Originated in autonomous system 100
Any instance of autonomous system 100
Directly connected autonomous system paths
Q378. While troubleshooting an issue for a remote user, you must capture the communication between the user's computer and a server at your location. The traffic passes through a Cisco IOS-XE capable switch. Which statement about obtaining the capture is true?
A. The Embedded Packet Capture application in the IOS-XE Software can capture the packets, but there is a performance impact.
B. The Embedded Packet Capture application in the IOS-XE Software can capture the packets without impacting performance.
C. The Mini Protocol Analyzer embedded in the IOS-XE Software can capture the packets without impacting performance.
D. The Mini Protocol Analyzer embedded in the IOS-XE Software can be used to capture the packets, but there is a performance impact.
E. Wireshark can capture packets through a SPAN port, but there is a performance impact.
Q379. Which algorithm heavily influenced the algorithm used by path-vector protocols?
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.
Q380. Which two options are actions that EEM can perform after detecting an event? (Choose two.)
A. Place a port in err-disabled.
B. Generate an SNMP trap.
C. Reload the Cisco IOS Software.
D. Send an SMS.
To specify the action of generating a Simple Network Management Protocol (SNMP) trap when an Embedded Event Manager (EEM) applet is triggered, use the action snmp-trap command in applet configuration mode.
To specify the action of reloading the Cisco IOS software when an Embedded Event Manager (EEM) applet is triggered, use the action reload command in applet configuration mode.
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