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Q161. Which statement is true about conditional advertisements?
A. Conditional advertisements create routes when a predefined condition is met.
B. Conditional advertisements create routes when a predefined condition is not met.
C. Conditional advertisements delete routes when a predefined condition is met.
D. Conditional advertisements create routes and withhold them until a predefined condition is met.
E. Conditional advertisements do not create routes, they only withhold them until a predefined condition is met.
Answer: E
Explanation:
The Border Gateway Protocol (BGP) conditional advertisement feature provides additional control of route advertisement, depending on the existence of other prefixes in the BGP table. Normally, routes are propagated regardless of the existence of a different path. The BGP conditional advertisement feature uses the non-exist-map and the advertise-map keywords of the neighbor advertise-map command in order to track routes by the route prefix. If a route prefix is not present in output of the non-exist-map command, then the route specified by the advertise-map command is announced. This feature is useful for multihomed networks, in which some prefixes are advertised to one of the providers only if information from the other provider is not present (this indicates a failure in the peering session or partial reachability).
Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/16137-cond-adv.html
Q162. What is the function of the command ip pim autorp listener?
A. It allows a border PIM sparse mode router to accept autorp information from another autonomous system.
B. It allows the mapping agents to accept autorp information from the PIM rendezvous point.
C. It allows the routers to flood the autorp information in a sparse-mode-only network.
D. It allows a BSR to accept autorp information and translate it into BSR messages.
Answer: C
Explanation:
To cause IP multicast traffic for the two Auto-RP groups 224.0.1.39 and 224.0.1.40 to be Protocol Independent Multicast (PIM) dense mode flooded across interfaces operating in PIM sparse mode, use the ip pim autorp listener command in global configuration mode. To disable this feature, use the no form of this command.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipmulti/command/imc-cr-book/imc_i3.html#wp3085748429
Q163. For which feature is the address family "rtfilter" used?
A. Enhanced Route Refresh
B. MPLS VPN filtering
C. Route Target Constraint
D. Unified MPLS
Answer: C
Explanation:
With Multiprotocol Label Switching (MPLS) VPN, the internal Border Gateway Protocol (iBGP) peer or Route Reflector (RR) sends all VPN4 and/or VPN6 prefixes to the PE routers. The PE router drops the VPN4/6 prefixes for which there is no importing VPN routing and forwarding (VRF). This is a behavior where the RR sends VPN4/6 prefixes to the PE router, which it does not need. This is a waste of processing power on the RR and the PE and a waste of bandwidth. With Route Target Constraint (RTC), the RR sends only wanted VPN4/6 prefixes to the PE. 'Wanted' means that the PE has VRF importing the specific prefixes. RFC 4684 specifies Route Target Constraint (RTC). The support is through a new address family rtfilter for both VPNv4 and VPNv6.
Reference: http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/116062-technologies-technote-restraint-00.html
Q164. Refer to the exhibit.
Which two statements about the EEM applet configuration are true? (Choose two.)
A. The EEM applet runs before the CLI command is executed.
B. The EEM applet runs after the CLI command is executed.
C. The EEM applet requires a case-insensitive response.
D. The running configuration is displayed only if the letter Y is entered at the CLI.
Answer: A,D
Explanation:
sync Indicates whether the policy should be executed synchronously before the CLI command executes.
. If the yes keyword is specified, the policy will run synchronously with the CLI command.
. If the no keyword is specified, the policy will run asynchronously with the CLI command.
nocase
(Optional) Specifies case insensitive comparison.
Here we see that the sync knob was enabled so A is correct. However, C is not correct as the nocase argument was not used, so the applet is configured to display the config only if a capital Y is issued.
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/eem/command/eem-cr-book/eem-cr-a2.html
Q165. Refer to the exhibit.
Which statement about this device configuration is true?
A. The NMS needs a specific route configured to enable it to reach the Loopback0 interface of the device.
B. The ifindex of the device could be different when the device is reloaded.
C. The device will allow anyone to poll it via the public community.
D. The device configuration requires the AuthNoPriv security level.
Answer: B
Explanation:
One of the most commonly used identifiers in SNMP-based network management applications is the Interface Index (ifIndex) value. IfIndex is a unique identifying number associated with a physical or logical interface. For most software, the ifIndex is the name of the interface. Although relevant RFCs do not require that the correspondence between particular ifIndex values and their interfaces be maintained across reboots, applications such as device inventory, billing, and fault detection depend on this correspondence. Consider a situation where a simple monitoring software (like MRTG) is polling the interface statistics of the router specific serial interface going to the internet.
As an example, you could have these conditions prior to re-initialization:
physical port ifIndex
ethernet port
tokenring port
2
serial port
3
Therefore, the management application is polling the ifIndex 3, which corresponds to the serial port.
After the router re-initialization (reboot, reload and so on) the conditions change to something similar to this:
physical port
ifIndex
ethernet port
3
tokenring port
1
serial port
2
The management application continues polling the ifIndex 3, which corresponds now to the ethernet port. Therefore, if the management application is not warned by a trap, for example, that the router has been rebooted, the statistics polled could be completely wrong.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/simple-network-management-protocol-snmp/28420-ifIndex-Persistence.html
Q166. DRAG DROP
Drag and drop the Metro Ethernet circuit on the left to the corresponding Service Type category on the right.
Answer:
Q167. Which two modes of operation does BFD support? (Choose two.)
A. synchronous mode
B. asynchronous mode
C. demand mode
D. echo mode
E. aggressive mode
F. passive mode
Answer: B,C
Explanation:
A session may operate in one of two modes: asynchronous mode and demand mode. In
asynchronous mode, both endpoints periodically send Hello packets to each other. If a number of those packets are not received, the session is considered down. In demand mode, no Hello packets are exchanged after the session is established; it is assumed that the endpoints have another way to verify connectivity to each other, perhaps on the underlying physical layer. However, either host may still send Hello packets if needed.
Reference: http://en.wikipedia.org/wiki/Bidirectional_Forwarding_Detection
Q168. Which two statements about the passive-interface command are true? (Choose two.)
A. A RIP router listens to multicast updates from its neighbor but stops sending multicast updates on the passive interface.
B. In OSPF, configuring passive-interface at the interface level suppresses hello packets for the interface and all sub interfaces.
C. An EIGRP router can form neighbor relationship on the passive interface, but incoming and outgoing multicast updates are disabled on the interface.
D. A RIP router disables all incoming and outgoing multicast updates in the passive interface.
E. In EIGRP, the passive interface stops sending hello packets.
F. In OSPF, the passive interface can receive incoming routing updates and update the device routing table.
Answer: A,E
Q169. Refer to the exhibit.
What is wrong with the configuration of the tunnel interface of this DMVPN Phase II spoke router?
A. The interface MTU is too high.
B. The tunnel destination is missing.
C. The NHRP NHS IP address is wrong.
D. The tunnel mode is wrong.
Answer: D
Explanation:
By default, tunnel interfaces use GRE as the tunnel mode, but a DMVPN router needs to be configured for GRE multipoint by using the “tunnel mode gre multipoint” interface command.
Q170. Which BGP aggregate address configuration advertises only the aggregate address, with attributes inherited from the more specific routes?
A. summary-only as-set
B. as-set
C. summary
D. summary-only
Answer: A
Explanation:
Example:
router bgp 300
neighbor 2.2.2.2 remote-as 100
neighbor 3.3.3.3 remote-as 200
neighbor 4.4.4.4 remote-as 400
aggregate-address 160.0.0.0 255.0.0.0 summary-only as-set
!--- With the as-set configuration command, the aggregate
!--- inherits the attributes of the more-specific routes.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/5441-aggregation.html
