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Q1. A network engineer is investigating the cause of a service disruption on a network segment and executes the debug condition interface fastethernet f0/0 command. In which situation is the debugging output generated? 

A. when packets on the interface are received and the interface is operational 

B. when packets on the interface are received and logging buffered is enabled 

C. when packets on the interface are received and forwarded to a configured syslog server 

D. when packets on the interface are received and the interface is shut down 

Answer:

Explanation: 


Q2. What is the primary service that is provided when you implement Cisco Easy Virtual Network? 

A. It requires and enhances the use of VRF-Lite. 

B. It reduces the need for common services separation. 

C. It allows for traffic separation and improved network efficiency. 

D. It introduces multi-VRF and label-prone network segmentation. 

Answer:

Explanation: 


Q3. Refer to the following configuration command. 

router (config-line)# ntp master 10 

Which statement about this command is true? 

A. The router acts as an authoritative NTP clock and allows only 10 NTP client connections. 

B. The router acts as an authoritative NTP clock at stratum 10. 

C. The router acts as an authoritative NTP clock with a priority number of 10. 

D. The router acts as an authoritative NTP clock for 10 minutes only. 

Answer:

Explanation: 


Q4. A network engineer executes the “ipv6 flowset” command. What is the result? 

A. Flow-label marking in 1280-byte or larger packets is enabled. 

B. Flow-set marking in 1280-byte or larger packets is enabled. 

C. IPv6 PMTU is enabled on the router. 

D. IPv6 flow control is enabled on the router. 

Answer:

Explanation: 

Enabling Flow-Label Marking in Packets that Originate from the Device This feature allows the device to

track destinations to which the device has sent packets that

are 1280 bytes or larger.

SUMMARY STEPS

1.enable

2.configure terminal

3.ipv6 flowset

4.exit

5.clear ipv6 mtu

DETAILED STEPS

Command or Action Purpose

Step 1 enable Enables privileged EXEC mode.

Enter your password if prompted.

Example:

Device> enable

Step 2 configure terminal Enters global configuration mode.

Example:

Device# configure

terminal

Step 3 ipv6 flowset Configures flow-label marking in 1280-byte or larger packets sent by the device.

Example:

Device# configure

terminal

Step 3 ipv6 flowset Configures flow-label marking in 1280-byte or larger packets sent by the device.

Example:

Device(config)# ipv6

flowset

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/15- mt/ip6b-15-mtbook/ip6-mtu-path-disc.html


Q5. What is a function of NPTv6? 

A. It interferes with encryption of the full IP payload. 

B. It maintains a per-node state. 

C. It is checksum-neutral. 

D. It rewrites transport layer headers. 

Answer:

Explanation: 

RFC 6296 describes a stateless IPv6-to-IPv6 Network Prefix Translation (NPTv6) function,

designed to provide address independence to the edge network. It is transport-agnostic with respect to

transports that do not checksum the IP header, such as SCTP, and to transports that use the TCP/UDP/

DCCP (Datagram Congestion Control Protocol) pseudo-header and checksum NPTv6 provides a simple

and compelling solution to meet the address-independence requirement in IPv6. The addressindependence

benefit stems directly from the translation function of the network prefix translator. To avoid

as many of the issues associated with NAPT44 as possible, NPTv6 is defined to include a two-way,

checksum-neutral, algorithmic translation function, and nothing else. Reference: http://tools.ietf.org/html/

rfc6296


Q6. A network administrator uses IP SLA to measure UDP performance and notices that packets on one router have a higher one-way delay compared to the opposite direction. Which UDP characteristic does this scenario describe? 

A. latency 

B. starvation 

C. connectionless communication 

D. nonsequencing unordered packets 

E. jitter 

Answer:

Explanation: 

Cisco IOS IP SLAs provides a proactive notification feature with an SNMP trap. Each measurement

operation can monitor against a pre-set performance threshold.

Cisco IOS IP SLAs generates an SNMP trap to alert management applications if this threshold is crossed.

Several SNMP traps are available: round trip time, average jitter, one-way latency, jitter, packet loss, MOS, and connectivity tests.

Here is a partial sample output from the IP SLA statistics that can be seen:

router#show ip sla statistics 1

Round Trip Time (RTT) for Index 55

Latest RTT: 1 ms

Latest operation start time: *23:43:31.845 UTC Thu Feb 3 2005 Latest operation return code: OK

RTT Values:

Number Of RTT: 10 RTT Min/Avg/Max: 1/1/1 milliseconds Latency one-way time:

Number of Latency one-way Samples: 0

Source to Destination Latency one way Min/Avg/Max: 0/0/0 milliseconds Destination to Source Latency

one way Min/Avg/Max: 0/0/0 milliseconds 

Reference:

http://www.cisco.com/en/US/technologies/tk648/tk362/tk920/technologies_white_paper09186a0

0802d5efe.html


Q7. A router with an interface that is configured with ipv6 address autoconfig also has a link-local address assigned. Which message is required to obtain a global unicast address when a router is present? 

A. DHCPv6 request 

B. router-advertisement 

C. neighbor-solicitation 

D. redirect 

Answer:

Explanation: 

Autoconfiguration is performed on multicast-enabled links only and begins when a multicastenabled

interface is enabled (during system startup or manually). Nodes (both, hosts and routers) begin

the process by generating a link-local address for the interface. It is formed by appending the interface

identifier to well-known link-local prefix FE80 :: 0. The interface identifier replaces the right-most zeroes of

the link-local prefix. Before the link-local address can be assigned to the interface, the node performs the

Duplicate Address Detection mechanism to see if any other node is using the same link-local address on

the link. It does this by sending a Neighbor Solicitation message with target address as the "tentative"

address and destination address as the solicited-node multicast address corresponding to this tentative

address. If a node responds with a Neighbor Advertisement message with tentative address as the target

address, the address is a duplicate address and must not be used. Hence, manual configuration is

required. Once the node verifies that its tentative address is unique on the link, it assigns that link-local

address to the interface. At this stage, it has IP-connectivity to other neighbors on this link. The

autoconfiguration on the routers stop at this stage, further tasks are performed only by the hosts. The

routers will need manual configuration (or stateful configuration) to receive site-local or global addresses.

The next phase involves obtaining Router Advertisements from routers if any routers are present on the

link. If no routers are present, a stateful configuration is required. If routers are present, the Router

Advertisements notify what sort of configurations the hosts need to do and the hosts receive a global

unicast IPv6 address. Reference: https://sites.google.com/site/amitsciscozone/home/important-tips/ipv6/

ipv6-stateless- autoconfiguration


Q8. An engineer executes the ip flow ingress command in interface configuration mode. What is the result of this action? 

A. It enables the collection of IP flow samples arriving to the interface. 

B. It enables the collection of IP flow samples leaving the interface. 

C. It enables IP flow while disabling IP CEF on the interface. 

D. It enables IP flow collection on the physical interface and its subinterfaces. 

Answer:

Explanation: 


Q9. Which common issue causes intermittent DMVPN tunnel flaps? 

A. a routing neighbor reachability issue 

B. a suboptimal routing table 

C. interface bandwidth congestion 

D. that the GRE tunnel to hub router is not encrypted 

Answer:

Explanation: 

DMVPN Tunnel Flaps Intermittently Problem DMVPN tunnel flaps intermittently. Solution

When DMVPN tunnels flap, check the neighborship between the routers as issues with neighborship

formation between routers may cause the DMVPN tunnel to flap. In order to resolve this problem, make

sure the neighborship between the routers is always up. Reference: http://www.cisco.com/c/en/us/support/

docs/security-vpn/ipsec-negotiation-ike- protocols/29240-dcmvpn.html#Prblm1


Q10. Which three benefits does the Cisco Easy Virtual Network provide to an enterprise network? (Choose three.) 

A. simplified Layer 3 network virtualization 

B. improved shared services support 

C. enhanced management, troubleshooting, and usability 

D. reduced configuration and deployment time for dot1q trunking 

E. increased network performance and throughput 

F. decreased BGP neighbor configurations 

Answer: A,B,C 

Explanation: