NO.1 Which two options are EIGRP route authentication encryption modes? (Choose two.)
A. MD5
B. HMAC-SHA-256bit
C. ESP-AES
D. HMAC-AES
Answer: A,B

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Explanation:
Packets exchanged between neighbors must be authenticated to ensure that a device accepts
packets only from devices that have the same preshared authentication key. Enhanced Interior
Gateway Routing Protocol (EIGRP) authentication is configurable on a per-interface basis; this means
that packets exchanged between neighbors connected through an interface are authenticated. EIGRP
supports message digest algorithm 5 (MD5) authentication to prevent the introduction of
unauthorized information from unapproved sources. MD5 authentication is defined in RFC 1321.
EIGRP also supports the Hashed Message Authentication Code-Secure Hash Algorithm-256 (HMAC-
SHA-256) authentication method.
Reference. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/xe-
3s/irexe-3s-book/ire-sha-256.html

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 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.

NO.4 Which statement about OTV is true?
A. The overlay interface becomes active only when configuration is complete and it is manually
enabled.
B. OTV data groups can operate only in PIM sparse-mode.
C. The overlay interface becomes active immediately when it is configured.
D. The interface facing the OTV groups must be configured with the highest MTU possible.
Answer: A

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Explanation:
OTV has the following configuration guidelines and limitations:
Reference:
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/nxos/OTV/config_guide/b_Cisco_N
exus_7000_Series_NX-OS_OTV_Configuration_Guide/basicotv.html

NO.5 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.6 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.7 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.8 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

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