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Q441. Which three modes are valid for forming an EtherChannel between the ports of two switches? (Choose three.) 

A. Active/active 

B. Active/passive 

C. Passive/passive 

D. Auto/auto 

E. Auto/desirable 

F. Desirable/on 

Answer: A,B,E 

Explanation: 

To configure an EtherChannel using LACP negotiation, each side must be set to either active or passive; only interfaces configured in active mode will attempt to negotiate an EtherChannel. Passive interfaces merely respond to LACP requests. PAgP behaves the same, but its two modes are refered to as desirable and auto. 

Reference: http://packetlife.net/blog/2010/jan/18/etherchannel-considerations/ 


Q442. Which two statements about OSPF route types are true? (Choose two.) 

A. The cost of an external type 2 route is the sum of the external and internal costs. 

B. The cost of an external type 2 route is the same as the external cost. 

C. Intra-area routes originate outside of their area. 

D. Inter-area routes originate inside their area. 

E. The cost of an external type 1 route is the same as the internal cost. 

F. For routes to the same destination, external type 1 routes are preferred over external type 2 routes. 

Answer: B,F 

Explanation: 

External routes fall under two categories, external type 1 and external type 2. The difference between the two is in the way the cost (metric) of the route is being calculated. The cost of a type 2 route is always the external cost, irrespective of the interior cost to reach that route. A type 1 cost is the addition of the external cost and the internal cost used to reach that route. A type 1 route is always preferred over a type 2 route for the same destination. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/7039-1.html 


Q443. Which component of MPLS architecture uses protocols such as the label distribution protocol and tag distribution protocol to exchange labels? 

A. control plane 

B. data plane 

C. forwarding plane 

D. routing plane 

Answer:


Q444. Which statement about Cisco Discovery Protocol is true? 

A. The multicast address 0100.0cdd.dddd is used as the destination address for periodic advertisements. 

B. An inactive VLAN that is configured on an access port passes periodic Cisco Discovery Protocol advertisements. 

C. The multicast address 0100.0ccc.ccd is used as the destination address for periodic advertisements. 

D. A VLAN must be active on an access port before periodic Cisco Discovery Protocol advertisements are passed. 

Answer:

Explanation: 

All CDP packets include a VLAN ID. If you configure CDP on a Layer 2 access port, the CDP packets sent from that access port include the access port VLAN ID. If you configure CDP on a Layer 2 trunk port, the CDP packets sent from that trunk port include the lowest configured VLAN ID allowed on that trunk port. CDP messages on the active physical interfaces (Ethernet NIC) to a well-known multicast address (0100.0CCC.CCCC. 


Q445. Which EIGRP packet types are sent as unicast packets? 

A. hello, update, query 

B. query, SIA query, reply 

C. SIA query, reply, ACK 

D. query, SIA query, SIA reply 

Answer:


Q446. Like OSPFv2, OSPFv3 supports virtual links. Which two statements are true about the IPv6 address of a virtual neighbor? (Choose two.) 

A. It is the link-local address, and it is discovered by examining the hello packets received from the virtual neighbor. 

B. It is the link-local address, and it is discovered by examining link LSA received by the virtual neighbor. 

C. It is the global scope address, and it is discovered by examining the router LSAs received by the virtual neighbor. 

D. Only prefixes with the LA-bit not set can be used as a virtual neighbor address. 

E. It is the global scope address, and it is discovered by examining the intra-area-prefix-LSAs received by the virtual neighbor. 

F. Only prefixes with the LA-bit set can be used as a virtual neighbor address. 

Answer: E,F 

Explanation: 

OSPF for IPv6 assumes that each router has been assigned link-local unicast addresses on each of the router's attached physical links. On all OSPF interfaces except virtual links, OSPF packets are sent using the interface's associated link-local unicast address as the source address. A router learns the link-local addresses of all other routers attached to its links and uses these addresses as next-hop information during packet forwarding. On virtual links, a global scope IPv6 address MUST be used as the source address for OSPF protocol packets. The collection of intra-area-prefix-LSAs originated by the virtual neighbor is examined, with the virtual neighbor's IP address being set to the first prefix encountered with the LA-bit set. 

Reference: https://tools.ietf.org/html/rfc5340 


Q447. Which two statements about IPv4 and IPv6 networks are true? (Choose two.) 

A. In IPv6, hosts perform fragmentation. 

B. IPv6 uses a UDP checksum to verify packet integrity. 

C. In IPv6, routers perform fragmentation. 

D. In IPv4, fragmentation is performed by the source of the packet. 

E. IPv4 uses an optional checksum at the transport layer. 

F. IPv6 uses a required checksum at the network layer. 

Answer: A,B 


Q448. Which two statements about SoO checking in EIGRP OTP deployments are true? (Choose two). 

A. During the import process, the SoO value in BGP is checked against the SoO value of the site map. 

B. During the reception of an EIGRP update, the SoO value in the EIGRP update is checked against the SoO value of the site map on the ingress interface. 

C. At the ingress of the PE/CE link, the SoO in the EIGRP update is checked against the SoO within the PE/CE routing protocol. 

D. At the egress of the PE/CE link, the SoO is checked against the SoO within the PE/CE routing protocol. 

E. The SoO is checked at the ingress of the backdoor link. 

F. The SoO is checked at the egress of the backdoor link. 

Answer: A,B 

Explanation: 

. SoO checking: 

– During the import process the SoO value in BGP update is checked against the SoO value of the site-map attached to VRF interface. The update is propagated to CE only if there is no match (this check is done regardless of protocol used on PE/CE link). 

– At reception of EIGRP update, the SoO value in the EIGRP update is checked against the SoO value of site-map attached to the incoming interface. This update is accepted only if there is no match (this check can optionally be done on backdoor router). 

Reference: http://www.cisco.com/c/en/us/products/collateral/ios-nx-os-software/ip-routing/whitepaper_C11-730404.html 


Q449. For which three routing protocols can Cisco PfR provide direct route control? (Choose three.) 

A. OSPF 

B. IS-IS 

C. BGP 

D. EIGRP 

E. static routing 

F. ODR 

Answer: C,D,E 

Explanation: 

Q. Can you elaborate more on the Parent Route and why it's so important to PfR? 

A. Yes. For any route that PfR modifies or controls (BGP, Static, PIRO, EIGRP, PBR), having a Parent prefix in the routing table eliminates the possibility of a routing loop occurring. This is naturally a good thing to prevent in routed networks. 

Reference: http://docwiki.cisco.com/wiki/Performance_Routing_FAQs#Route_Control 


Q450. Which statement about traffic management when PIM snooping is enabled is true? 

A. Traffic is restricted to host ports. 

B. All multicast traffic is flooded to the designated router. 

C. Join message are flooded to all routers. 

D. Designated routers receive traffic only from groups through which a join message is received. 

Answer: