Q19
You are the network administrator at CertKing .com. You want to telnet to a router on the CertKing
network, however, the connection is denied. You verify connectivity to the router by pinging the router
successfully. You need to enter a set of commands on the remote router to allow Telnet connectivity.
Which commands should you use?A. router(config)# line con 0
router(config-line)# password welcome
router(config-line)# loginB. router(config)# line aux 0 4
router(config-line)# password welcome
router(config-line)# loginC. router(config)# line vty 0 4
router(config-line)# password welcome
router(config-line)# loginD. router(config)# line tty 0 4
router(config-line)# password welcome
router(config-line)# enable loginAns: C

Explanation:
Several concurrent Telnet connections to a router are allowed. The line vty 0 4 command signifies that this
configuration applies to vtys (virtual teletypes/terminals) 0 through 4.
Reference:
CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) page 178


Q20
You are the network administrator at CertKing . Your assistant made a number of errors when utilizing
the router setup mode facility. You want to exit setup mode without applying the changes that your
assistant made.
What should you do? (Select two.)A. Type exit at the setup dialog.B. Type close at the setup dialog.C. Press the Ctrl-C key combination.D. Press the Ctrl-X key combination.E. Issue the copy startup-config command.F. Issue the write erase command.Ans: A, C
Reference:
CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) page 191


Q21
You are a technician at CertKing . Your newly appointed CertKing trainee wants to know what a MAC
address is.
What would your reply be? (Choose all that apply.)A. It is a globally unique IP address.B. It is a unique address in a broadcast domain.C. It is provided by the manufacturer of the NIC.D. It is used as part of the IPX/SPX configuration.E. It is a logical address.Ans: B, C

Explanation:
The IEEE defines the format and assignment of LAN addresses. The IEEE requires globally unique MAC
addresses on all network interface cards (NICs). The IEEE calls these addresses MAC addresses because the
MAC protocols such as IEEE 802.3 define the addressing details. To ensure a unique MAC address, the
Ethernet card manufacturers encode the MAC address onto the card, usually in a ROM chip.
Reference:
CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) page 64


Q22
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 how the hosts on an
Ethernet network will know when to resume transmissions after a collision has occurred.
What would your reply be? (Choose all that apply.)A. The destination host sends a request to the source for retransmission.B. The jam signal indicates that the collision has been cleared.C. The hosts will attempt to resume transmission after a time delay has expired.D. An electrical pulse indicates that the collision has cleared.E. The router on the segment will signal that the collision has cleared.Ans: C

Explanation:
1. A device with a frame to send listens until Ethernet is not busy.
2. When the Ethernet is not busy, the sender begins sending the frame.
3. The sender listens to make sure that no collision occurred.
4. Once the senders hear the collision, they each send a jamming signal, to ensure that all stations
recognize the collision.
5. After the jamming is complete, each sender randomizes a timer and waits that long.
6. When each timer expires, the process starts over with step 1.
Reference:
CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) page 55


Q23
You are the network administrator at CertKing . You want to implement a network medium that is not
susceptible to EMI.
Which type of cabling should you use?A. Thicknet coaxial cable.B. Thinnet coaxial cable.C. Category 5 UTP cable.D. Category 5 STP cable.E. Fiber optic cable.Ans: E

Explanation:
Fiber - More secure, long distance, not susceptible to EMI, highest speeds.
Reference:
CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) page 297


Q24
What does the term computer language refer to?A. BinaryB. DecimalC. HexadecimalD. OctalAns: A