A. 128

B. 192

C. 254

D. 256

E. 510 Answer: C Class C addresses range from 192.0.0.1 through 223.225.225.225 and default subnet mask of 255.255.255.0. In Class C addresses, the first 24 bits are used as for the network ID while only the last 8 bits is used for the host ID. Using the 2n-2 formula, we can calculate that Class C addresses can support a maximum of 16,777,214 (224- 2) networks and 254 (28-2) hosts. Reference: Cisco Sources 640-821 Study Guide version 1.1, Section 2.1.3 "IP Address Classes"; Cisco Sources 640-821 Study Guide version 1.1, Section 2.1.4 "CIDR Notation".

QUESTION 3 You are the network administrator at Cisco Sources. From your workstation you telnet to a router VTY line. You perform a number of configurations on the router. You now want to terminate the telnet connection. What command must you issue to terminate the Telnet connection?

A. close

B. disable

C. disconnect

D. suspend

E. exit Answer: C Explanation: Terminating a Telnet session Use the disconnect from the router you Telnetted from.

Reference: CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) Page 398

QUESTION 4 You work as a network administrator at Cisco Sources. You are required to configure two routers named Cisco Sources1 and Cisco Sources2. The topology for the Cisco Sources network is shown in the following exhibit:

The enable password is "Cisco Sources". You are required to configure the following passwords on the Cisco Sources2 router:

• Console password: Jack
• Vty lines 0-4 password: king To configure the router click on a host icon that is connected to a router by a serial cable. Answer: Click on Host 4: Router Cisco Sources2: Cisco Sources2>enable Password:Cisco Sources Cisco Sources2#config terminal Cisco Sources2(config)#line console 0 Cisco Sources2(config-line)#login Cisco Sources2(config-line)#password Jack Cisco Sources2(config-line)#exit Cisco Sources2(config)#line vty 0 4 Cisco Sources2(config-line)#login Cisco Sources2(config-line)#password king Cisco Sources2(config-line)#exit Cisco Sources2(config)#exit Cisco Sources2#copy running-config startup-config Reference: CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) Page 177
• QUESTION 5 You work as a network administrator at Cisco Sources. You are required to configure two routers named Cisco Sources1 and Cisco Sources2. The network topology is shown in the exhibit. The routers have the following configuration specifications:
• They are named Cisco Sources1 and Cisco Sources2
• The password on both routers is "Cisco Sources".
• They have the following IP addresses Cisco Sources1 E0: 10.0.239.155 Cisco Sources2 No IP address specifications. Your task is to configure the E0 interface on the Cisco Sources1 router. You should use the IP address 10.0.239.155 and the default subnet mask. To configure the router click on a host icon that is connected to a router. Answer: Router Cisco Sources1: Cisco Sources1>enable Password:Cisco Sources Cisco Sources1#config terminal Cisco Sources1(config)#int e 0 Cisco Sources1(config-if)#ip address 10.0.239.155 255.0.0.0 Cisco Sources1(config-if)#no shutdown Cisco Sources1(config-line)#exit Cisco Sources1(config)#exit Cisco Sources1#copy running-config startup-config Reference: CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) Page 177

QUESTION 6 You are the network administrator at Cisco Sources.com. The internal Cisco Sources network is shown in the following exhibit:

With regard to the IP addressing information in the exhibit, which interface will Router B use to forward an IP datagram to a host with an IP address of 10.10.10.10?

A. S0

B. E0

C. E1

D. E2 Answer: B Explanation: IP address 10.10.10.10 is on the 10.10.10.0 network. This network is attached to the E0 interface on RouterB. This would thus be the path to an address on the 10.10.10.0 network.

QUESTION 7 Match the Layer 4 network service with the corresponding TCP port number by dragging the options on the left to the correct target on the right.

Answer:

Reference: Cisco Sources 640-821 Study Guide version 1.1, Appendix B, "Common TCP and UDP Ports Assignments".

QUESTION 8 With regard to Positive Acknowledgment and Retransmission (PAR), which of the following are true? (Choose all that apply.)

A. The source device will only retransmit lost packets on the request of the destination device.

B. The source device starts a timer when it sends a segment and retransmits if an acknowledgment is not received before the timer expires.

C. The destination device acknowledges receipt of a segment by sending a packet with a new sequence number and the ACK bit sent.

D. The destination device acknowledges receipt of a segment by sending a packet that indicates the next sequence number it expects.

E. If the destination device does not receive a segment, all segments are retransmitted.

F. The source device keeps a record of all segments sent and expects and acknowledgment of each. Answer: B, D, F Explanation: Answer B

• The sender sets a re-transmission timer, awaiting acknowledgement, just in case the acknowledgement is lost, or in call all the transmitted segments are lost. Answer D
• The client will reply with an acknowledgement that requests for the next sequence number. Answer F
• The only way to know that it has sent the certain sequence number by keeping a record of it. Reference: CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) page 156

QUESTION 9 Which of the following standards defines Wi-Fi?

A. IEEE 802.11a

B. IEEE 802.11b

C. IEEE 802.11g

D. IEEE 802.11i

E. IEEE 802.11 Answer: E Explanation: IEEE 802.11 was the original standard for wireless networks. However, the standard had a few ambiguities allowed for potential problems with compatibility between devices. To ensure compatibility, a group of companies formed the Wireless Ethernet Compatibility Alliance (WECA), which has come to be known as the IEEE 802.11 wireless network products that have passed the Wi-Fi Alliance certification tests. Reference: Cisco Sources 640-821 Study Guide version 1.1, Section 1.4.8 "Wireless Networks".

QUESTION 10 Which of the following statements are true? (Choose all that apply.)

A. The extended ping command is supported from user EXEC mode.

B. The extended ping command is supported from privileged EXEC mode.

C. With the extended ping command you can specify the port to be pinged.

D. With the extended ping command you can specify the timeout.

E. With the extended ping command you can specify the datagram size. Answer: B D E Explanation: The extended ping command works only at the privileged EXEC command line. Datagram size [100]: Size of the ping packet (in bytes). Default: 100 bytes. Timeout in seconds [2]: Timeout interval. Default: 2 (seconds). The ping is declared successful only if the ECHO REPLY packet is received before this time interval. Reference: http://www.cisco.com/en/US/tech/tk365/tk554/technologies_tech_note09186a0080093f22.shtml#extend_ping