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Q411. Which statement about the RPF interface in a BIDIR-PIM network is true?
A. In a BIDIR-PIM network, the RPF interface is always the interface that is used to reach the PIM rendezvous point.
B. In a BIDIR-PIM network, the RPF interface can be the interface that is used to reach the PIM rendezvous point or the interface that is used to reach the source.
C. In a BIDIR-PIM network, the RPF interface is always the interface that is used to reach the source.
D. There is no RPF interface concept in BIDIR-PIM networks.
Answer: A
Explanation:
RPF stands for "Reverse Path Forwarding". The RPF Interface of a router with respect to an address is the interface that the MRIB indicates should be used to reach that address. In the case of a BIDIR-PIM multicast group, the RPF interface is determined by looking up the Rendezvous Point Address in the MRIB. The RPF information determines the interface of the router that would be used to send packets towards the Rendezvous Point Link for the group.
Reference: https://tools.ietf.org/html/rfc5015
Q412. Which two statements about MAC ACLs are true? (Choose two.)
A. They support only inbound filtering.
B. They support both inbound and outbound filtering.
C. They are configured with the command mac access-list standard.
D. They can filter non-IP traffic on a VLAN and on a physical interface.
Answer: A,D
Explanation:
MAC ACL, also known as Ethernet ACL, can filter non-IP traffic on a VLAN and on a physical Layer 2 interface by using MAC addresses in a named MAC extended ACL. The steps to configure a MAC ACL are similar to those of extended named ACLs. MAC ACL supports only inbound traffic filtering.
Reference: http://www.ciscopress.com/articles/article.asp?p=1181682&seqNum=4
Q413. Which two options are advantages of NetFlow version 9 over NetFlow version 5? (Choose two.)
A. NetFlow version 9 adds support for IPv6 headers.
B. NetFlow version 9 adds support for MPLS labels.
C. NetFlow version 9 adds support for the Type of Service field.
D. NetFlow version 9 adds support for ICMP types and codes.
Answer: A,B
Explanation:
NetFlow version 9 includes support for all of these fields that version 5 supports and can optionally include additional information such as Multiprotocol Label Switching (MPLS) labels and IPv6 addresses and ports.
Q414. DRAG DROP
Drag and drop the method for refreshing BGP prefixes on the left to the corresponding description on the right.
Answer:
Q415. 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.
Answer: D
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Q416. Which two are features of DMVPN? (Choose two.)
A. It does not support spoke routers behind dynamic NAT.
B. It requires IPsec encryption.
C. It only supports remote peers with statically assigned addresses.
D. It supports multicast traffic.
E. It offers configuration reduction.
Answer: D,E
Explanation:
DMVPN Hub-and-spoke deployment model: In this traditional topology, remote sites (spokes) are aggregated into a headend VPN device at the corporate headquarters (hub). Traffic from any remote site to other remote sites would need to pass through the headend device. Cisco DMVPN supports dynamic routing, QoS, and IP Multicast while significantly reducing the configuration effort.
Reference: http://www.cisco.com/c/en/us/products/collateral/security/dynamic-multipoint-vpn-dmvpn/data_sheet_c78-468520.html
Q417. Which two loop-prevention mechanisms are implemented in BGP? (Choose two.)
A. A route with its own AS in the AS_PATH is dropped automatically if the route reenters its own AS.
B. A route with its own cluster ID in the CLUSTER_LIST is dropped automatically when the route reenters its own AS.
C. The command bgp allowas-in enables a route with its own AS_PATH to be dropped when it reenters its own AS.
D. The command bgp bestpath as-path ignore enables the strict checking of AS_PATH so that they drop routes with their own AS in the AS_PATH.
E. The command bgp bestpath med missing-as-worst assigns the smallest possible MED, which directly prevents a loop.
Answer: A,B
Explanation:
When dealing with the possibility of routing updates making their way back into an AS, BGP relies on the information in the AS_path for loop detection. An update that tries to make its way back into the AS it was originated from will be dropped by the border router. With the introduction of route reflectors, there is a potential for having routing loops within an AS. A routing update that leaves a cluster might find its way back inside the cluster. Loops inside the AS cannot be detected by the traditional AS_path approach because the routing updates have not left the AS yet. BGP offers two extra measures for loop avoidance inside an AS when route reflectors are configured.
Using an Originator ID
The originator ID is a 4-byte, optional, nontransitive BGP attribute (type code 9) that is created by the route reflector. This attribute carries the router ID of the originator of the route in the local AS. If, because of poor configuration, the update comes back to the originator, the originator ignores it.
Using a Cluster List
The cluster list is an optional, nontransitive BGP attribute (type code 10). Each cluster is represented with a cluster ID.
A cluster list is a sequence of cluster IDs that an update has traversed. When a route reflector sends a route from its clients to nonclients outside the cluster, it appends the local cluster ID to the cluster list. If the route reflector receives an update whose cluster list contains the local cluster ID, the update is ignored. This is basically the same concept as the AS_path list applied between the clusters inside the AS.
Reference: http://borg.uu3.net/cisco/inter_arch/page11.html
Q418. Refer to the exhibit.
How can the EIGRP hello and hold time for Gig0/0 be changed to 5 and 15?
A. No action is required, since Gig0/0 is not listed with a nondefault hello and hold time.
B. Add the commands ip hello-interval eigrp 1 5 and ip hold-time eigrp 1 15 under interface Gig0/0.
C. Add the commands hello-interval 5 and hold-time 15 under "af-interface Gig0/0" under the address family.
D. Add the commands default hello-interval and default hold-time under the af-interface Gig0/0 statement under the address family.
Answer: C
Explanation:
To configure the hello interval for an interface, use the hello-interval command in interface configuration mode To configure the hold time for an interface, use the hold-time command in interface configuration mode.
Reference: http://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-1/routing/command/reference/b_routing_cr41crs/b_routing_cr41crs_chapter_010.html#wp2 323069468
Q419. Independent, multiple OSPF processes are entered on the same router, and the processes have the same destination route. Which OSPF process is used?
A. The route with the fewest hops is used.
B. Both processes are used to load balance the traffic.
C. The first route process that places a route into the routing table is used.
D. The route with the shortest prefix is used.
Answer: C
Q420. Which two statements about OSPF are true? (Choose two.)
A. External type 2 routes are preferred over interarea routes.
B. Intra-area routes are preferred over interarea routes.
C. External type 1 routes are preferred over external type 2 routes.
D. External type 1 routes are preferred over intra-area routes.
E. External type 2 routes are preferred over external type 1 routes.
Answer: B,C