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	Q6 Which three of the following statements are true about BGP attributes? (Select three)A. MED is an optional attribute.B. Origin is an optional attribute.C. Next-hop is an optional attribute.D. Local Preference is a discretionary attribute.E. AS-Path is a well-known mandatory attribute.F. Community is a well-known mandatory attribute. Ans: A, D, E Explanation: A: The Multiple Exit Discriminator (MED) attribute is optional. D: The local preference attribute is used to prefer an exit point from the local autonomous system (AS). It is a well-known discretionary attribute. E: When a route advertisement passes through an autonomous system, the AS number is added to an ordered list of AS numbers that the route advertisement has traversed. The AS-Path attribute is mandatory. Note: BGP metrics are called path attributes. Optional attributes are recognized by some implementations, but are expected not to be recognized by everyone. A well-known mandatory attributes must be present in all update messages. The attributes defined by BGP include: AS-path o Next-hop o Origin Well-known discretionary attributes: o Local preference o Atomic aggregate Optional transitive attributes: o Aggregator o Communities Optional non-transitive attribute: o Multi-Exit-Discriminator (MED) Reference: Border Gateway Protocol http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/bgp.htm Incorrect Anss B: The origin attribute indicates how BGP learned about a particular route. It can have three values: IGP, EGP or incomplete. It is a required attribute. C: The EBGP next-hop attribute is the IP address that is used to reach the advertising router. It is a required attribute. F: The community attribute provides a way of grouping destinations, called communities, to which routing decisions can be applied. It is not mandatory. Q7 The BGP community attribute tags route for the sake of consistency in route filtering. Which of the Ans choices below correctly describe the community attribute?A. Optional and transitive.B. Optional and non-transitive.C. Well-known and mandatory.D. Well-known and discretionary. Ans: A Explanation: The community attribute is an optional transitive attribute that can be in the range 0 to 4,294,967,200. Each network can be a member of more than one community. Q8 You are a guest lecturer at the CertKing Academy teaching some CCNP hopefuls about BGP. One of the students, Bob asks you what a BGP community is. How would you respond?A. Communities are tagged by default in outgoing updates.B. Communities can only be used within one autonomous system.C. Communities are a means of tagging routes to ensure consistent filtering.D. Communities perform summarization of blocks of contiguous network prefixes. Ans: C Explanation: A community is a group of destinations which share some common property. No tag is used by default. Communities are a means of tagging routes to ensure consistent filtering or route-selection policy. Reference: RFC 1997, BGP Communities Attribute Incorrect Anss A: By default, all destinations belong to the general Internet community. B: Each autonomous system administrator may define which communities a destination belongs to. D: No summarization is performed by communities. Communications can be aggregated however. Q9 What are two reasons as to why would an administrator peer an IBGP router with another IBGP router within an autonomous system (AS)? ) (Select two)A. IBGP routes are not propagated to other EBGP peers.B. IBGP routes that a router originates are propagated to other IBGP peers.C. IBGP routes are propagated to other IBGP speakers in the AS that are not peers.D. IBGP routes that are learned from an IBGP neighbor are propagated to only EBGP peers. Ans: B, D Explanation: IGBP routes are propagated to all IBGP peers and only the IBGP peers. Note: You can configure Border Gateway Protocol (BGP) either within an autonomous system or between different autonomous systems. When run within an autonomous system, it's called internal BGP (IBGP). When run between different autonomous systems, it's called external BGP (EBGP). Q0 Which two of the statements below are true regarding BGP peer groups? (Select two)A. The peer group name is passed to other routers in the peer group.B. A peer group is a group of BGP neighbors with different update policies.C. The peer group name is only local to the router on which it is configured.D. A peer group allows options that affect outbound updates to be overridden.E. A peer group is a more efficient way to update BGP than configuration individual neighbors. Ans: C, E Explanation: C: The peer group name is only local to the router it is configured on, it is not passed to any other router. E: Neighbors with the same update policies can be grouped into peer groups to simplify configuration and make update calculation more efficient. Reference: RFC 1771, A Border Gateway Protocol 4 (BGP-4) Incorrect Anss A: A BGP peer group does not necessarily have a name, it might have a number. B: BGP peers use the same update policy. D: A peer group does not have this option. Q1 What is true about the process of BGP peering? (Select two)A. Periodic keepalives are used to verify connectivity.B. Incremental keepalives are used to verify connectivity.C. It provides a reliable connection between two BGP routers.D. It provides a "best effort" connection between two BGP routers. Ans: A, C Explanation: Incorrect Anss A: The default keepalive frequency is 60 seconds. C: BGP peering provides a reliable connection between BGP routers. Reference: BGP Peer Groups http://www.cisco.com/warp/public/459/29.html Incorrect Anss B: Keepalives messages are not incremental. D: BGP peers form a reliable connection. Q2 What would happen in the unlikely event that a BGP route reflector would receive an update from a peer in a different autonomous system?A. It discards the update.B. It sends the update to all IBGP peers.C. It sends the update only to nonclients.D. It sends the update only to route reflector clients.E. It sends the update to all routers in the autonomous system. Ans: B Reference: http://www.cisco.com/en/US/products/sw/iosswrel/ps1828/products_configuration_guide_chapte r09186a00800ca571.html#5155 Q3 Which of the following statements is true about BGP peer communications?A. Communication between BGP peers runs over RIP.B. Communication between BGP peers runs over TCP.C. Communication between BGP peers runs over UDP.D. Communication between BGP peers runs over ICMP. Ans: B Explanation: BGP communicate through a TCP connection. Reference: Reference: Border Gateway Protocol http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/bgp.htm Q4 Which three of the following statements are characteristics of a BGP autonomous system? (Select three)A. It uses only Interior Gateway Protocols (IGPs).B. EGPs are used to connect different autonomous systems.C. It is a set of routers under a single technical administration.D. It uses EGPs to route packets to other autonomous systems and IGPs to route packets within the autonomous system.E. It uses IGPs to route packets to other autonomous systems and EGPs to route packets within the autonomous system. Ans: B, C, D Explanation: A BGP autonomous system is a group of routers all administered as a single team working on mutual packet switching goals. EGP's (Exterior Gateway Protocol's) handle routing to outside autonomous systems which are on the exterior of that particular autonomous system, and IGP's (Interior Gateway Protocol's) route within, on the interior of autonomous systems. Incorrect Anss: A is incorrect because an autonomous system can use an exterior gateway protocol. E is incorrect because the roles of IGP's and EGP's are mixed up. Q5 Which of the following statements is true about the BGP synchronization command? (Select two)A. Synchronization must be enabled when implementing a multi-homed BGP connection to multiple ISPs.B. If it is turned ON, a prefix learned from IBGP neighbor is valid only if a non-bgp (IGP) route exists for that prefix.C. Synchronization is necessary when peering with an EBGP neighbor.D. Synchronization improves BGP routing convergence.E. Synchronization can be turned off if all the transit routers in an Autonomous system running full mesh IBGP. Ans: A, E Explanation: If your autonomous system will be passing traffic through it from another autonomous system to a third autonomous system, it is very important that your autonomous system be consistent about the routes that it advertises. For example, if your BGP were to advertise a route before all routers in your network had learned about the route through your IGP, your autonomous system could receive traffic that some routers cannot yet route. To prevent this from happening, BGP must wait until the IGP has propagated routing information across your autonomous system. This causes BGP to be synchronized with the IGP. Synchronization is enabled by default. Only if all routers in the transit path in the AS are running BGP it is safe to turn synchronization off. Reference: Building Scalable Cisco Networks (Ciscopress) page 33 http://www.cisco.com/en/US/products/sw/iosswrel/ps1826/products_configuration_guide_chapte r09186a00800877b5.html Q6 Router CK1 receives BGP routing advertisements from router CK2 via the network 165.5.0.0, by default what is the value of the next hop attribute?A. 40.1.1.1B. 40.1.1.2C. 40.1.1.3D. Router CK1 does not accept the advertisement from Router CK2 because Router CK1 is not peering with Router CK3 via BGP.E. Router CK2 does not advertise network 165.50.0.0 to Router CK1 because the network is not directly connected to Router CK2 . Ans: B \| CCNA bootcamps \| CCNA resume \| CCIE written \| CCNP salary \| Cisco CCDA training \| 640 801 practice test questions \| CCDA certification braindumps \| Cisco certification education \| Cisco CCNA test \| Free CCNA books \| CCSP bootcamps \| CCNP braindumps \| CCNA exam question \| Cisco \| Cisco study material \|