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Q451. You are installing a new device to replace a device that failed. The configuration of the failed device is stored on a networked server, and the new device has an RXBOOT image installed. Under which condition does the streamlined Setup mode fail?
A. The last four bits of the configuration register are not equal to the decimal value 0 or 1.
B. The startup configuration file was deleted.
C. Bit 6 is set in the configuration register.
D. The startup configuration is corrupt.
The lowest four bits of the configuration register (bits 3, 2, 1, and 0) form the boot field. The boot field determines if the router boots manually, from ROM, or from Flash or the network. To change the boot field value and leave all other bits set to their default values, follow these guidelines:
. If you set the configuration register boot field value to 0x0, you must boot the operating system manually with the boot command.
. If you set the configuration register boot field value to 0x1, the router boots using the default ROM software.
. If you set the configuration register boot field to any value from 0x2 to 0xF, the router uses the boot field value to form a default boot filename for booting from a network server. For more information about the configuration register bit settings and default filenames, refer to the appropriate router hardware installation guide.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/configfun/command/reference/ffun_r/frf010. html
Q452. Which statement about NAT64 is true?
A. It uses one-to-one mapping between IPv6 addresses and IPv4 addresses.
B. It requires static address mapping between IPv6 addresses and IPv4 addresses.
C. It can be used to translate an IPv6 network to another IPv6 network.
D. It can be configured for stateless and stateful translation.
Q453. When BGP route reflectors are used, which attribute ensures that a routing loop is not created?
B. local preference
C. multiexit discriminator
D. originator ID
As the iBGP learned routes are reflected, routing information may loop. The route reflector model has the following mechanisms to avoid routing loops:
. Originator ID is an optional, nontransitive BGP attribute. It is a 4-byte attributed created by a route reflector. The attribute carries the router ID of the originator of the route in the local autonomous system. Therefore, if a misconfiguration causes routing information to come back to the originator, the information is ignored.
. Cluster-list is an optional, nontransitive BGP attribute. It is a sequence of cluster IDs that the route has passed. When a route reflector reflects a route from its clients to nonclient peers, and vice versa, it appends the local cluster ID to the cluster-list. If the cluster-list is empty, a new cluster-list is created. Using this attribute, a route reflector can identify if routing information is looped back to the same cluster due to misconfiguration. If the local cluster ID is found in the cluster-list, the advertisement is ignored.
Q454. Which statement is true about MLD?
A. MLD v1 gives hosts the ability to receive multicast packets from specific source addresses.
B. All MLD messages are sent with a link-local IPv6 source address of FF02::D.
C. The multicast address field is cleared to zero when sending an MLD report message.
D. MLD is used by IPv6 routers to discover multicast listeners on a directly attached link.
IPv6 Multicast Listener Discovery (MLD) is used by IPv6 devices to discover multicast listeners (nodes that want to receive multicast packets destined for specific multicast addresses) on directly attached links. There are two versions of MLD. MLD version 1 is based on version 2 of the IGMP for IPv4, and MLD version 2 is based on version 3 of the IGMP for IPv4. IPv6 multicast for Cisco software uses both MLD version 2 and MLD version 1.
Q455. Refer to the exhibit.
You have just created a new VRF on PE3. You have enabled debug ip bgp vpnv4 unicast updates on PE1, and you can see the route in the debug, but not in the BGP VPNv4 table.
Which two statements are true? (Choose two.)
A. VPNv4 is not configured between PE1 and PE3.
B. address-family ipv4 vrf is not configured on PE3.
C. After you configure route-target import 999:999 for a VRF on PE3, the route will be accepted.
D. PE1 will reject the route due to automatic route filtering.
E. After you configure route-target import 999:999 for a VRF on PE1, the route will be accepted.
The route target extended community for VPLS auto-discovery defines the import and export policies that a VPLS instance uses. The export route target sets an extended community attribute number that is appended to all routes that are exported from the VPLS instance. The import route target value sets a filter that determines the routes that are accepted into the VPLS instance. Any route with a value in its import route target contained in its extended attributes field matching the value in the VPLS instance’s import route target are accepted. Otherwise the route is rejected.
Q456. What is the destination address of an IGMPv2 general membership query?
D. the multicast group address
Q457. 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.
Q458. Which timer expiration can lead to an EIGRP route becoming stuck in active?
As noted above, when a route goes into the active state, the router queries its neighbors to find a path to the pertinent network. At this point, the router starts a three minute active timer by which time it must receive replies from all queried neighbors. If a neighbor has feasible successors for the route, it will recalculate its own local distance to the network and report this back. However, if a neighbor does not have a feasible successor, it also goes into active state. In some cases, multiple routers along multiple query paths will go into active state as routers continue to query for the desired route. In most cases, this process will yield responses from all queried routers and the sought after route will transition back into the passive state within the three minute SIA query timer. In the case that none of the queried routers can provide a feasible successor, the route is cleared. In some cases, a response is not received between two neighbor routers because of link failures, congestion or some other adverse condition in either the network or on the queried router, and the three minute active timer expires on the router originating the query. When this happens, the querying router that did not receive a response logs a “DUAL-3-SIA” or “stuck-in-active” error for the route and then drops and restarts its adjacency with the non-responding router
Q459. Where should the passive-interface command be used?
A. Under the routing process for interfaces that need to be routed, but prevented from peering
B. under the routing process for interfaces that need to be routed and allowed to peer
C. under the interface configuration for interfaces that need to be routed, but prevented from peering
D. under the interface configuration for interfaces that need to be routed and allowed to peer
E. under the VTY configuration within global configuration mode
Passive-interface is a feature you enable on a per interface basis which allows a particular interface to participate in a routing process but prevents that interface from forming neighbor relationships by not sending hello packets and discarding received hello packets.
Q460. Refer to the exhibit.
You discover that only 1.5 Mb/s of web traffic can pass during times of congestion on the given network.
Which two options are possible reasons for this limitation? (Choose two.)
A. The web traffic class has too little bandwidth reservation.
B. Video traffic is using too much bandwidth.
C. The service-policy is on the wrong interface.
D. The service-policy is going in the wrong direction.
E. The NAT policy is adding too much overhead.
In this example, the web traffic will fall into the default class, which is only 15 percent of the 10Mbps Internet connection (1.5Mbps). Meanwhile, video traffic is allowed 50% of the 10 Mbps.