Thứ Ba, 4 tháng 5, 2010

CCNA S2- Version 4.1 Chaper 6 100%

1. What is the purpose of a routing protocol?
It is used to build and maintain ARP tables.
It provides a method for segmenting and reassembling data packets.
It allows an administrator to devise an addressing scheme for the network.
*It allows a router to share information about known networks with other routers.
It provides a procedure for encoding and decoding data into bits for packet forwarding.

2. Why is fast convergence desirable in networks that use dynamic routing protocols?
Routers will not allow packets to be forwarded until the network has converged.
Hosts are unable to access their gateway until the network has converged.
*Routers may make incorrect forwarding decisions until the network has converged.
Routers will not allow configuration changes to be made until the network has converged.

3. In which situation would a company register for its own autonomous system number (ASN)?
when the company's ISP adds connection points to the Internet
when additional routers are added to the corporate internetwork
when more than one interior routing protocol is used
*when the company uses two or more ISPs

4. What term refers to a group of networks that uses the same internal routing policies and is controlled by a single administrative authority?
virtual private network
*autonomous system

5. Which protocol is an exterior routing protocol?

6. What device enables an ISP to connect with other ISPs to transfer data?
*border gateway router
web server
interior router

7. Which part of an IP packet does the router use to make routing decisions?
source IP address
source MAC address
*destination IP address
destination MAC address

8. What statement is true regarding an AS number?
*AS numbers are controlled and registered for Internet use.
Interior routing protocols require registered AS numbers.
ISPs require all customers to have registered AS numbers.
All routers at an ISP must be assigned the same AS number.

9. Which routing protocol is used to exchange data between two different ISPs?
RIP v2

10. Consider this routing table entry:

R [120/1] via 00:00:27 Serial0/1

What type of route is this?
a static route
a default route
*a RIP route
an OSPF route
an EIGRP route
a directly-connected route

11. Refer to the exhibit. If all routers are running RIP and network goes down, when will R3 learn that the network is no longer available?
in 30 seconds
in 60 seconds
in 90 seconds

12. What information is included in RIPv2 routing updates that is not included in RIPv1 updates?
*subnet mask
area identification
hop count
autonomous system number

13. What two types of businesses would benefit from registering as their own autonomous systems? (Choose two.)
a home business with one ISP connection
*a global business with connections to multiple local ISPs
*a medium-sized nationwide business with Internet connectivity through different ISPs
a large enterprise with two connections to the same ISP
a small ISP with a single Internet connection through a larger ISP

14. Which two statements describe static routes? (Choose two.)
They are created in interface configuration mode.
*They require manual reconfiguration to accommodate network changes.
They automatically become the default gateway of the router.
*They are identified in the routing table with the prefix S
They are automatically updated whenever an interface is reconfigured or shutdown.

15. What is the difference between interior and exterior routing protocols?
Exterior routing protocols are only used by large ISPs. Interior routing protocols are used by small ISPs.
Interior routing protocols are used to route on the Internet. Exterior routing protocols are used inside organizations.
Exterior routing protocols are used to administer a single autonomous system. Interior routing protocols are used to administer several domains.
*Interior routing protocols are used to communicate within a single autonomous system. Exterior routing protocols are used to communicate between multiple autonomous systems.

16. Refer to the exhibit. Which configuration command or commands contributed to the output that is shown?
routerA(config-router)# no version 2
routerA(config)# interface fa0/0
routerA(config-if)# ip address
*routerA(config-router)# network
routerA(config)# no ip default-gateway

17. Refer to the exhibit. All of the routers are running RIP. There are two paths from router A to the network. Based on the output of the show ip route command on router A, which route was entered into the routing table and why?
A,B,C,D because it has the lowest administrative distance
A,E,F,G,D because it has the lowest administrative distance
*A,B,C,D because it has the lowest metric
A,E,F,G,D because it has the lowest metric

18. What is the purpose of the network command in configuring RIP?
to specify whether RIPv1 or RIPv2 will be used as the routing protocol
to allow the router to monitor RIP updates that occur on other routers
*to identify the directly connected networks that will be announced in RIP updates
to configure the IP address on an interface that will use RIP
to identify all of the remote networks that should be reachable from the router

19. Refer to the exhibit. If connectivity between the two hosts is maintained, what is the maximum number of RIP routers that can be in the path from HostA to HostB?

20. Refer to the exhibit. Router B receives a packet with a destination address of What will router B do?
drop the packet
forward the packet via the route to
forward the packet via the route to
*use the default route

5 nhận xét:

  1. I select all your answers and got only 95%.
    Thanks for your help, but it's not 100% correct.

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  2. Sorry, my bad, the question I got wrong is not in here. That's the only one missing and I got it wrong. LOL, my apoligies.
    Keep up the good work.

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  3. Nhận xét này đã bị tác giả xóa.

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  4. A network is converged and the routing tables are complete. When a packet needs to be forwarded, what is the first criterion used to determine the best path in the routing table?

    the route with the highest bandwidth
    the route with the smallest administrative distance
    #the route with the longest address and mask match to the destination
    the route with the best combination of administrative distance and lowest cost

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  5. What is a purpose of the network commond configuring RIPv2 as the routing protocol?

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