Exam: 640-821
Title: Introduction to Cisco Networking Technologies
(INTRO)
Total Question 159



Q1
You are a technician at CertKing . You tell your newly appointed CertKing trainee that Ethernet
networks are broadcast domains and collision domains. Your trainee wants to know what happens when
a collision occurs on the network.
What would your reply be? (Choose all that apply.)A. Each device stops transmitting for a short time.B. A jam signal informs all devices that a collision occurred.C. When data transmission resumes, the devices that were involved in the collision have priority to
transmit.D. The devices that are involved in the collision stops transmitting for a short time.E. The collision invokes a random back-off algorithm.Ans: A, B, EA. Each ( all ) devices stop transmitting for a short time.B. A jamning signal is sent out to all devices that a collision has occurred.E. The collision invokes a back-off algorithm


Q2
You are a technician at CertKing . CertKing plans to implement a public network. The company's ISP
suggested that CertKing register a Class IP address. The CertKing CEO wants to know how many usable
IP addresses are provided in a Class C address.
What would your reply be?A. 128B. 192C. 254D. 256E. 510Ans: 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:
CertKing 640-821 Study Guide version 1.1, Section 2.1.3 "IP Address Classes";
CertKing 640-821 Study Guide version 1.1, Section 2.1.4 "CIDR Notation".


Q3
You are the network administrator at CertKing . 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. closeB. disableC. disconnectD. suspendE. exitAns: 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


Q4
You work as a network administrator at CertKing . You are required to configure two routers named
CertKing 1 and CertKing 2. The topology for the CertKing network is shown in the following exhibit:


The enable password is " CertKing ".
You are required to configure the following passwords on the CertKing 2 router:
o Console password: tess
o 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.Ans:
Click on Host 4:
Router CertKing 2:
CertKing 2>enable
Password: CertKing
CertKing 2#config terminal
CertKing 2(config)#line console 0
CertKing 2(config-line)#login
CertKing 2(config-line)#password tess
CertKing 2(config-line)#exit
CertKing 2(config)#line vty 0 4
CertKing 2(config-line)#login
CertKing 2(config-line)#password king
CertKing 2(config-line)#exit
CertKing 2(config)#exit
CertKing 2#copy running-config startup-config
Reference:
CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) Page 177


Q5
You work as a network administrator at CertKing . You are required to configure two routers named
CertKing 1 and CertKing 2. The network topology is shown in the exhibit.
The routers have the following configuration specifications:
o They are named CertKing 1 and CertKing 2
o The password on both routers is " CertKing ".
o They have the following IP addresses
CertKing 1
E0: 10.0.239.155
CertKing 2
No IP address specifications.
Your task is to configure the E0 interface on the CertKing 1 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.Ans:
Router CertKing 1:
CertKing 1>enable
Password: CertKing
CertKing 1#config terminal
CertKing 1(config)#int e 0
CertKing 1(config-if)#ip address 10.0.239.155 255.0.0.0
CertKing 1(config-if)#no shutdown
CertKing 1(config-line)#exit
CertKing 1(config)#exit
CertKing 1#copy running-config startup-config
Reference:
CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) Page 177