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Q411. 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/ 

Q412. 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:

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 

Q413. Which regular expression will match prefixes that originated from AS200? 

A. ^$ 

B. ^200_ 

C. _200$ D. ^200) 

E. _200_ 

Answer:

Explanation: 

Example on how to deny all prefixes originated in Autonomous System 200 

router bgp 100 

neighbor 10.1.1.1 remote-as 65535 

neighbor 10.1.1.1 route-map map1 in 

route-map map1 permit 10 

match as-path 1 

ip as-path access-list 5 deny _200$ 

ip as-path access-list 5 permit .* 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/termserv/configuration/guide/12_4t/tsv_12_4t_bo ok/tsv_reg_express.html 

Q414. Which three values can you use to configure an ERSPAN destination session? (Choose three.) 

A. VLAN ID 

B. source IP address 

C. destination IP address 

D. ID number 

E. VRF 

F. session name 

Answer: B,D,E 

Q415. Refer to the exhibit. 

Notice that debug ip bgp updates have been enabled. What can you conclude from the debug output? 

A. This is the result of the clear ip bgp 10.1.3.4 in command. 

B. This is the result of the clear ip bgp 10.1.3.4 out command. 

C. BGP neighbor 10.1.3.4 performed a graceful restart. 

D. BGP neighbor 10.1.3.4 established a new BGP session. 

Answer:

Explanation: 

If you enter the clear ip bgp out command for a BGP peer, that router resends its BGP prefixes to that peer. This does not cause a change in the best path on the receiving BGP peer. Hence, there is no change in the Table Version on that peer. 

When you run the debug ip bgp updates on the receiving router, you see: 

BGP(0): 10.1.3.4 rcvd UPDATE w/ attr: nexthop 10.1.3.4, origin i, metric 0, merged path 4, AS_PATH 

BGP(0): 10.1.3.4 rcvd 10.100.1.1/32…duplicate ignored 

The received update is recognized as a duplicate, so it is ignored and no best path change occurs. 

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/116511-technote-tableversion-00.html 

Q416. Which command sets the maximum segment size for a TCP packet initiated from a router? 

A. ip mtu 

B. ip tcp adjust-mss 

C. ip tcp mss 

D. ip tcp window-size 

Answer:

Q417. 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 

Q418. Which three message types are used for prefix delegation in DHCPv6? (Choose three.) 

A. DHCP Discover 

B. Renew 

C. Solicit 

D. DHCP Offer 

E. Advertise 

F. DHCP Ack 

Answer: B,C,E 

Explanation: 

DHCPv6 Message Types 

For a client to get an IPv6 address successfully from a DHCPv6 server, the Client-Server Conversation happens using the following messages. 

Client—>Server Messages 

Server—>Client Messages 

Solicit, Request, Confirm, Renew, Rebind, Release, Decline, Information-Request Advertise, Reply, Reconfigure 

Lets look at each message types in detail: 

SOLICIT 

This is the first step in DHCPv6, where a DHCPv6 client sends a Solicit message to locate DHCPv6 servers. 

ADVERTISE 

Upon receiving a Solicit Message from the client, the DHCPv6 server sends an Advertise message to indicate that it is available for DHCP service, in response to a Solicit message received from a client. 

REQUEST 

This message is sent by the DHCPv6 client.Client sends a Request message to request configuration parameters which includes IP addresses or delegated prefixes, from a specific server. 

CONFIRM 

Confirm message is sent by the client to any available server in the network to confirm that the client is still on the same link or it has to be removed. This message also confirms the IPv6 addresses that are assigned to the link are still valid. This could happen in case when a client detects a change in link-layer connectivity or if the device is powered on and it is found that one or more leases are still valid. Note that only the prefix portion of the addresses are validated and not the actual leases. 

RENEW 

A client sends a Renew message to the server when it wants to extend the lifetimes on the addresses and other configuration parameters assigned to the client and also to update other configuration parameters. 

REBIND 

In case of No response from the DHCPv6 Server for the Renew message, the client sends a Rebind message to any available server to extend the lifetimes on the address and to update other configuration parameters. 

REPLY 

A Reply message is sent by the DHCPv6 Server in response to a Solicit, Request, Renew, Rebind message received from a client. The reply message is sent by the server in response to a confirm message (either confirming or denying) that the addresses assigned to the client are appropriate.In short the server acknowledge receipt of a Release or Decline message by sending a REPLY message. 

RELEASE 

Release message as the name implies, is sent by the client to the server that has assigned the addresses, to indicate that the client will no longer use the assigned addresses (one or more). 

DECLINE 

Client sends a Decline message to the DHCPv6 server to tell that the one or more addresses assigned by the server is already in use 

RECONFIGURE 

The Reconfigure Message is sent by the DHCPv6 server to the client when the server has new or updated information of configuration parameters. It tells the client to initiate a information-request/reply message to the server so as to receive the updated information. 

INFORMATION-REQUEST 

Information-Request message is sent by the client to the server to update the configuration parameters 

Reference: https://supportforums.cisco.com/blog/153426/implementing-dhcpv6-introduction 

Q419. DRAG DROP 

Drag and drop the BGP attribute on the left to the correct category on the right. 

Answer: 

Q420. Which two routing protocols are not directly supported by Cisco PfR route control, and rely on the Cisco PfR subfeature PIRO? (Choose two.) 

A. BGP 

B. EIGRP 

C. Static routing 

D. OSPF 

E. IS-IS 

Answer: D,E 

Explanation: 

Protocol Independent Route Optimization (PIRO) introduced the ability of Performance Routing (PfR) to search for a parent route—an exact matching route, or a less specific route—in the IP Routing Information Base (RIB), allowing PfR to be deployed in any IP-routed environment including Interior Gateway Protocols (IGPs) such as OSPF and IS-IS. 

Reference: http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr-piro.html 

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