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642-801 : Building Scalable Cisco Internetworks (BSCI)

QUESTION 191 You are a technician at Cisco Highway. The Cisco Highway network is connected to the internet via more than one ISP. Your newly appointed Cisco Highway trainee wants to know what this type of network is known as. What would your reply be?

A. multi-gnomed

B. mega-homed C. multi-homed

D. maxi-homed Answer: C Explanation: If your company requires high availability to the internet you might consider having more than one ISP provide your internet connectivity. This arrangement is referred to as being "multi-homed". Many businesses that do a large amount of their business via "the net" utilize two or more ISP in order to provide fault tolerance should one service provider experience difficulties. Chapter: 4

QUESTION 192 Which of the following routing protocols support VLSM?

A. EIGRP

B. IGRP

C. OSPF

D. RIP version 1

E. RIP version 2 Answer: A, C, E Explanation: EIGRP, RIP v.2 and OSPF are classless routing protocols, which means that they are capable of including a specialized subnet mask in routing updates. Any protocol that carries a subnet mask in updates is a candidate for supporting VLSM. IGRP and RIP v.1 are classful routing protocols, which they are excluded from VLSM membership. Chapter: 4

QUESTION 193 You are a trainee technician at Cisco Highway. The Cisco Highway network implements the Border Gateway Protocol (BGP). Your instructor tells you that BGP comes in two flavors. He wants to what these two flavors are. What would your reply be? (Choose all that apply.)

A. reliable gateway protocol (RGP)

B. interior gateway protocol (IGP)

C. silent gateway protocol (SGP)

D. exterior gateway protocol (EGP) Answer: B, D Explanation: BGP runs in either of two capacitates, as an IGP where it maintains routing tables inside the AS and EGP in which it maintains routing tables between AS's. Chapter: 4

QUESTION 194 You are a network engineer at Cisco Highway. Your newly appointed Cisco Highway trainee wants to know what command she should issue to view EIGRP entries in the routing table. What would your reply be?

A. show ip eigrp current

B. show ip eigrp route recent

C. show current ip eigrp route

D. show ip eigrp route

Answer: D Explanation: The "show ip eigrp route" command will show only the routing table entries that are EIGRP relevant. Chapter: 4

QUESTION 195 With regard to BGP Prefix Lists, which of the following statements are true?

A. prefix list sequence numbers by default start at 5 and increment by 5 as more are added

B. if a router matches a prefix list entry, processing of that list ceases

C. if a router matches a prefix list entry, processing of that list continues till another match is made

D. the command "no ip prefix-list sequence-number" deletes the specified prefix list from memory Answer: A, B Explanation: BGP prefix lists function much in the same way as ACLs, but with a few differences. Prefix lists allow increment updating, while ACLs do not. A router will cease processing a prefix list once a match is made; ACLs get processed all the way to the end. If you do not specify a BGP Prefix List sequence-numbering scheme, the list entries will increment by 5 as you enter new statements. Chapter: 4

QUESTION 196 You are a network engineer at Cisco Highway. Your newly appointed Cisco Highway trainee wants to know what the term "feasible distance" means. What would your reply be?

A. It is the distance from the web server to the mail server

B. It is the sum of the cost of the route from the next-hop to the next-hop

C. It is the distance from the firewall to the ISP

D. It is the distance from the next-hop router to the destination

E. None of the above answers is correct Answer: E

QUESTION 197 What is the relevance of "priority" when dealing with DR/BDR elections?

A. a priority of 1 means the router is eligible to become a DR

B. a priority of -1 means the router is eligible to become a DR

C. a priority of 0 means the router is ineligible to become a DR or BDR

D. DR/BDR elections run at regular intervals regardless of network topology status. Answer: A, C Explanation: DR and BDR elections are handled as follows: DR and BDR elections are handled as follows:

-Highest priority will become the DR
-Second Highest priority will become the BDR
-Only the malfunction of a DR or BDR will cause an election.
-A priority of "1" indicates eligibility to become a DR
-A priority of "0" indicates ineligibility to become a DR or BDR Chapter: 4

QUESTION 198 You are the network administrator at Cisco Highway. Your newly appointed Cisco Highway trainee wants to know when the use of BGP would be appropriate. What would your reply be? (Choose all that apply.)

A. if the border router in your AS is behind your corporate firewall

B. if your AS is at the edge of another routing protocol's border

C. if your network is multi-homed to the internet

D. if you have a need to manage the traffic entering and exiting your autonomous system

E. if your AS is a transit area for packets destined for another ASs Answer: C, D, E Explanation: When to use BGP is a tough question. The rule of thumb for when to use BGP usage is as follows: 1) if your network is multi-homed to the internet 2) if you have a need to manage the traffic entering and exiting your autonomous system 3) if your AS is a transit area for packets destined for another ASs Chapter: 4

QUESTION 199 You are the network administrator at Cisco Highway. Your newly appointed Cisco Highway trainee wants to know when the use of BGP would NOT be appropriate. What would your reply be? (Choose all that apply.)

A. if your network only has a single connection to the internet

B. if you have a low bandwidth link between ASs

C. if the selection of routes to outside ASs is not a high priority

D. if the AS connecting you to the internet charges by the packet

E. if the router connecting to your external AS is running IOS version 11.2 or earlier Answer: A, B, C Explanation: When not to use BGP is an even tougher question. The rule of thumb for when NOT to use BGP usage is as follows: 1) if your network only has a single connection to the internet 2) if you have a low bandwidth link between ASs 3) if the selection of routes to outside ASs is not a high priority Most of the choices for not to BGP relate to the fact that BGP can easily overwhelm an underpowered link or router. So you should only use BGP if your situation really warrants the configuration and management that comes along with it. Chapter: 4

QUESTION 200 What attribute must all BGP implementations recognize?

A. customized

B. synchronized

C. well-known

D. well-adjusted

E. optional Answer: C Explanation:

A BGP "well-known" attribute is one that must be recognized by all implementations of BGP and must be included in every update message. There are other types of updates that may or may not need to be included in the update messages. The following BGP attributes are the most commonly known: 1) Well-known mandatory. 2) Well-known discretionary. 3) Optional transitive. 4) Optional non-transitive. Chapter: 4

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