구텐모르겐 AmeriKa

어제에 이어 데모버전 문제를 5개 풀어보겠다.

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6. Which of the following best describes the following command: ip flow-export destination 192.168.1.50 1500?
a. It is not a valid NetFlow command
b. It is an SNMP command that exports 1500-byte packets to IP address 192.168.1.50
c. It is a NetFlow command that will export 1500-byte packets to IP address 192.168.1.50
d. It is a NetFlow command that allows IP address 192.168.1.50 to send traffic to port 1500
e. It is a NetFlow command that will specify that the NetFlow collector's IP address is 192.168.1.50 over UDP port 1500
f. It is an SNMP command that exports flows to destination address 192.168.1.50 for packets up to an MTU of 1500

IP주소 이후에 따라온 1500이란 숫자는 당연히 포트번호이므로 답은 e이다.

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7. Which of the following are valid methods of providing a router with information corcerning the location of the RP? (choose all that apply.)
a. Statically defined RP
b. Bootstrap Router
c. Auto-RP
d. RP Discovery Protocol (RDP)
e. RP Hellos
f. RP ARP (RARP)

d,e,f같은 프로토콜은 존재하지 않는다. 그러므로 답은 a,b,c이다.

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8. Which of the following are shared distribution tree characteristics? (choose all that apply.)
a. Memory requirements are higher for shared distribution tree than for source distribution tree.
b. Creates a tree from a central RP to all last-hop routers.
c. Uses a rendezvous point.
d. An optimal path is created between each source router and each last-hop router.
e. Place (S,G) entry in each router's multicast routing table.
f. Place (*,G) entry in a router's multicast routing to table.

우선 답은 b,c,f인데 shared distributin tree에서는 RP에 조인하고 싶은 라우터는 (*,G)상태를 생성하면서 RP와 last-hop router의 연결을 설정한다.

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9. Given the multicast IP address of 224.193.5.10, what wuold the corresponding multicast MAC address be?
a. 00-00-0c-05-0a
b. 00-00-0c-c1-05-0a
c. 01-00-5e-41-05-0a
d. 01-00-5e-41-05-0a
e. 00-00-0c-01-00-5e
f. 01-00-5e-c1-05-0a

답은 d.
224.193.5.10의 2진수는 1100.0001.0000.0101.0000.1010이고 여기서 첫번째 비트는 0으로 놓으므로 0100.0001.0000.0101.0000.1010이 되고 이것을 Hex로 표현하면 41-05-0a로 표기된다.

이진수와 십육진수의 변환이 궁금하면 http://en.wikipedia.org/wiki/Bit와 http://en.wikipedia.org/wiki/Hexadecimal에서 확인하기 바란다.

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10. Which of the following is an accurate description of the command copy startup-config ftp://kevin:cisco@192.168.1.74?
a. The configuration on the FTP server is copied to RAM
b. The command is not valid on a Cisco router
c. The configuration file in RAM is copied to an FTP server
d. The configuration file in NVRAM is copied to an FTP server.
e. The configuration on the FTP server is copied to NVRAM.
f. The configuration will be copied from NVRAM to an FTP sever with a filename of Kevin

답은 d이고, CCNA문제이므로 독자들의 자존심을 고려해서 설명은 생략. ㅎ