| Exam Number | 400-101 CCIE |
|---|---|
| Associated Certifications | CCIE Routing and Switching |
| Duration | 120 Minutes (90 - 110 questions) |
| Available Languages | English |
| Register | Pearson VUE |
| Exam Policies | Read current policies and requirements |
| Exam Tutorial | Review type of exam
questions |
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Exam Code: 400-101
Exam Name: CCIE Routing and Switching Written Exam v5.0
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Cisco 400-101 Real Questions 650 Q&As
Updated: 07-08,2015
400-101 Exam Prep Detail : 400-101 Real Questions
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NO.1 Which type of OSPF packet is an OSPF link state update packet?
A. type 1
B. type 2
C. type 3
D. type 4
E. type 5
Answer: D
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Explanation:
Link State Update packets are OSPF packet type 4. These packets implement the flooding of link state
advertisements. Each Link State Update packet carries a collection of link state advertisements one
hop further from its origin. Several link state advertisements may be included in a single packet.
Reference. http://www.freesoft.org/CIE/RFC/1583/107.htm
NO.2 Which option is an incorrect design consideration when deploying OSPF areas?
A. area 1 - area 0 - MPLS VPN backbone - area 0 - area 2
B. area 1 - MPLS VPN backbone - area 2
C. area 1 - MPLS VPN backbone - area 1
D. area 2 - area 0 - MPLS VPN backbone - area 1
E. area 0 - area 2 - MPLS VPN superbackbone - area 1
Answer: E
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Explanation:
In the case of MPLS-VPN Backbone as The OSPF superbackbone behaves exactly like Area 0 in regular
OSPF, so we cannot have two different area 0's that are not directly connected to each other. When
area 0 connects to the superbackbone, it simply becomes an extension of area 0.
NO.3 What is a reason to use DHCPv6 on a network that uses SLAAC?
A. To get a record of the IPs that are used by the clients
B. To push DNS and other information to the clients
C. No reason, because there is no need for DHCPv6 when using SLAAC
D. Because DHCPv6 can be used only in stateful mode with SLAAC to record the IPs of the clients
E. Because DHCPv6 can be used only in stateless mode with SLAAC to record the IPs of the clients
F. Because DHCPv6 is required to use first-hop security features on the switches
Answer: B
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Explanation:
SLAAC is by far the easiest way to configure IPv6 addresses, simply because you don't have to
configure any IPv6 address. With SLAAC, a host uses the IPv6 Neighbor Discovery Protocol (NDP) to
determine its IP address and default routers. Using SLAAC, a host requests and listens for Router
Advertisements (RA) messages, and then taking the prefix that is advertised to form a unique address
that can be used on the network. For this to work, the prefix that is advertised must advertise a prefix
length of 64 bits (i.e., /64). But the most significant of Stateless Address Autoconfiguration (SLAAC) is
it provided no mechanism for configuring DNS resolver information.Therefore SLACC can be used
along with DHCPv6 (Stateless) to push DNS and other information to the clients.
NO.4 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
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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_mu
ltic lass_link_ppp.pdf
http://www.cisco.com/c/en/us/td/docs/routers/access/500/520/software/configuration/guide/520_
S CG_Book/520scg_concepts.html
NO.5 Which congestion-avoidance or congestion-management technique can cause global
synchronization?
A. Tail drop
B. Random early detection
C. Weighted random early detection
D. Weighted fair queuing
Answer: A
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Explanation:
Tail Drop Tail drop treats all traffic equally and does not differentiate between classes of service.
Queues fill during periods of congestion. When the output queue is full and tail drop is in effect,
packets are dropped until the congestion is eliminated and the queue is no longer full. Weighted
Random Early Detection WRED avoids the globalization problems that occur when tail drop is used as
the congestion avoidance mechanism on the router. Global synchronization occurs as waves of
congestion crest only to be followed by troughs during which the transmission link is not fully utilized.
Global synchronization of TCP hosts, for example, can occur because packets are dropped all at once.
Global synchronization manifests when multiple TCP hosts reduce their transmission rates in
response to packet dropping, then increase their transmission rates once again when the congestion
is reduced. Reference.
http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/configuration/guide/fqos_c/qcfconav.html#w
p1 002048
NO.6 Which OSPF feature supports LSA rate limiting in milliseconds to provide faster convergence?
A. LSA throttling
B. incremental SPF
C. fast hello
D. SPF tuning
Answer: A
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Explanation:
The OSPF Link-State Advertisement (LSA) Throttling feature provides a dynamic mechanism to slow
down link-state advertisement (LSA) updates in OSPF during times of network instability. It also
allows faster Open Shortest Path First (OSPF) convergence by providing LSA rate limiting in
milliseconds. Reference.
http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fsolsath.html
NO.7 What is the purpose of Route Target Constraint?
A. to avoid using route reflectors in MPLS VPN networks
B. to avoid using multiple route distinguishers per VPN in MPLS VPN networks
C. to be able to implement VPLS with BGP signaling
D. to avoid sending unnecessary BGP VPNv4 or VPNv6 updates to the PE router
E. to avoid BGP having to perform route refreshes
Answer: D
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Explanation:
Some service providers have a very large number of routing updates being sent from RRs to PEs,
using considerable resources. A PE does not need routing updates for VRFs that are not on the
PE; therefore, the PE determines that many routing updates it receives are "unwanted." The PE
can filter out the unwanted updates using Route Target Constraint.
Reference.
http://www.cisco.com/c/en/us/td/docs/ios/ios_xe/iproute_bgp/configuration/guide/2_xe/irg_xe_bo
ok
/irg_rt_filter_xe.html.
NO.8 Which statement about the BGP originator ID is true?
A. The route reflector always sets the originator ID to its own router ID.
B. The route reflector sets the originator ID to the router ID of the route reflector client that injects
the route into the AS.
C. The route reflector client that injects the route into the AS sets the originator ID to its own router
ID.
D. The originator ID is set to match the cluster ID.
Answer: B
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Explanation:
An RR reflecting the route received from a RR-Client adds:
Reference. https://sites.google.com/site/amitsciscozone/home/bgp/bgp-route-reflectors
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