CCIE Routing and Switching Written Exam
| 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 |
The Cisco CCIE Routing and Switching written exam validate that professionals
have the expertise to: configure, validate, and troubleshoot complex enterprise
network infrastructure; understand how infrastructure components interoperate;
and translate functional requirements into specific device
configurations.
NO.1 Which two statements about the default behavior of
IS-IS are true? (Choose two.)A. The default IS-IS router type is L1/L2.
B. The default IS-IS metric type is wide.
C. The default IS-IS interface circuit type is L1/L2.
D. By default, two IS-IS routers must use the same hello interval and hold timer in order to become
neighbors.
Answer: A,C
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NO.2 Refer to the exhibit.
R1, R2, and R3 have full network connectivity to each other, but R2 prefers the path through R3 to
reach network 172.17.1.0/24. Which two actions can you take so that R2 prefers the path through R1
to reach 172.17.1.0/24? (Choose two.)
A. Set the reference bandwidth to 10000 on R1, R2, and R3.
B. Configure the cost on the link between R1 and R3 to be greater than 100 Mbps.
C. Set the reference bandwidth on R2 only.
D. Configure a manual bandwidth statement with a value of 1 Gbps on the link between R1 and R3.
E. Modify the cost on the link between R1 and R2 to be greater than 10 Gbps.
F. Configure a manual bandwidth statement with a value of 100 Mbps on the link between R1 and R2.
Answer: A,B
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Explanation:
By default, the reference bandwidth used in Cisco routers is 100Mbps, so FastEthernet and above will
have a cost of 1, so a gigabit interface and 10GE interface will be equal with a fastethernet. This is not
ideal. If we change the reference bandwidth to 100000 then the faster links will be used. Changing
the reference bandwidth needs to be done on all routers in the OSPF network. Increasing the cost on
the R1-R3 link will also cause the traffic to take the more direct route.
NO.3 A GRE tunnel is down with the error message %TUN-5-RECURDOWN:
Tunnel0 temporarily disabled due to recursive routing error.
Which two options describe possible causes of the error? (Choose two.)
A. Incorrect destination IP addresses are configured on the tunnel.
B. There is link flapping on the tunnel.
C. There is instability in the network due to route flapping.
D. The tunnel mode and tunnel IP address are misconfigured.
E. The tunnel destination is being routed out of the tunnel interface.
Answer: C,E
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Explanation:
The %TUN-5-RECURDOWN: Tunnel0 temporarily disabled due to recursive routing error message
means that the generic routing encapsulation (GRE) tunnel router has discovered a recursive routing
problem. This condition is usually due to one of these causes:
Reference. http://www.cisco.com/c/en/us/support/docs/ip/enhanced-interior-gateway-
routingprotocol-eigrp/22327-gre-flap.html
NO.4 Refer to the exhibit.
A spoke site that is connected to Router-A cannot reach a spoke site that is connected to Router-B,
but both spoke sites can reach the hub. What is the likely cause of this issue?
A. There is a router doing PAT at site B.
B. There is a router doing PAT at site A.
C. NHRP is learning the IP address of the remote spoke site as a /32 address rather than a /24
address.
D. There is a routing issue, as NHRP registration is working.
Answer: B
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Explanation:
If one spoke is behind one NAT device and another different spoke is behind another NAT device, and
Peer Address Translation (PAT) is the type of NAT used on both NAT devices, then a session initiated
between the two spokes cannot be established.
Reference.
http://www.cisco.com/c/en/us/td/docs/ios/ios_xe/sec_secure_connectivity/configuration/guide/co
nv ert/sec_dmvpn_xe_3s_book/sec_dmvpn_dt_spokes_b_nat_xe.html
NO.5 On which three options can Cisco PfR base its traffic routing? (Choose three.)
A. Time of day
B. An access list with permit or deny statements
C. Load-balancing requirements
D. Network performance
E. User-defined link capacity thresholds
F. Router IOS version
Answer: C,D,E
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Explanation:
Key Advantages of using PfR for Load balancing:
Reference. http://docwiki.cisco.com/wiki/PfR:Solutions:InternetOutboundLoadBalancing
NO.6 In which type of EIGRP configuration is EIGRP IPv6 VRF-Lite available?
A. stub
B. named mode
C. classic mode
D. passive
Answer: B
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Explanation:
The EIGRP IPv6 VRF Lite feature provides EIGRP IPv6 support for multiple VRFs. EIGRP for IPv6 can
operate in the context of a VRF. The EIGRP IPv6 VRF Lite feature provides separation between routing
and forwarding, providing an additional level of security because no communication between devices
belonging to different VRFs is allowed unless it is explicitly configured. The EIGRP IPv6 VRF Lite
feature simplifies the management and troubleshooting of traffic belonging to a specific VRF. The
EIGRP IPv6 VRF Lite feature is available only in EIGRP named configurations.
Reference. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6/configuration/15-2mt/ipv6-
152mt-book/ip6-eigrp.html#GUID-92B4FF4F-2B68-41B0-93C8-AAA4F0EC1B1B
NO.7 What is the cause of ignores and overruns on an interface, when the overall traffic rate of the
interface is low?
A. a hardware failure of the interface
B. a software bug
C. a bad cable
D. microbursts of traffic
Answer: D
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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). You will never see a sustained data traffic within show interface's "input rate"
counter as they are averaging bits per second (bps) over 5 minutes by default (way too long to
account for microbursts). You can understand microbursts from a scenario where a 3-lane highway
merging into a single lane at rush hour - the capacity burst cannot exceed the total available
bandwidth (i.e. single lane), but it can saturate it for a period of time.
Reference. http://ccieordie.com/?tag=micro-burst
NO.8 Refer to the exhibit.
Which OSPFv3 routes will be visible in the routing table of R2?
A. 2001:12::1/128
B. 2001:12::1/128, 2001:112::1/128
C. 2001:12::2/128
D. No OSPFv3 routes will be visible.
Answer: D
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Explanation:
The command "ipv6 unicast-routing" needs to be configured on both routers before any IPv6 routes
will be seen.
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Exam
Code: 400-101
Prüfungsname: CCIE Routing and Switching Written Exam v5.0
Aktulisiert: 20-08-2015, 400-101 prüfung
Nummer: 747 Q&As
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Aktulisiert: 20-08-2015, 400-101 prüfung
Nummer: 747 Q&As
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