You are the network administrator at CertKing .com. The internal CertKing 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. S0B. E0C. E1D. E2Ans: 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.


Q7
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.
Ans:

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


Q8
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.Ans: B, D, F

Explanation:
Ans B
o 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.
Ans D
o The client will reply with an acknowledgement that requests for the next sequence number.
Ans F
o 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


Q9
Which of the following standards defines Wi-Fi?A. IEEE 802.11aB. IEEE 802.11bC. IEEE 802.11gD. IEEE 802.11iE. IEEE 802.11Ans: 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
Wi-Fi Alliance, to ensure that their products would work together. The term Wi-Fi is now used to refer to any
IEEE 802.11 wireless network products that have passed the Wi-Fi Alliance certification tests.
Reference:
CertKing 640-821 Study Guide version 1.1, Section 1.4.8 "Wireless Networks".


Q10
Your boss at CertKing .com is curios about the extended ping command.
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.Ans: 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/ CK3 65/ CK5
54/technologies_tech_note09186a0080093f22.shtml#extend_ping


Q11
You are a technician at CertKing . Your newly appointed CertKing trainee wants to know which network
services the Cisco IOS provides.
What would your reply be? (Choose all that apply.)A. Routing and switching functions.B. Network topology definitions.C. Access to network resources.D. Quality of Service.E. Fault tolerance.Ans: A B C
Reference:
CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5)


Q12
You are a technician at CertKing . Your newly appointed CertKing trainee wants to know what the binary
value for 172 is.
What would your reply be?A. 10010010B. 10011001C. 10101100D. 10100110E. 11100011Ans: C

Explanation:
10101100= 128 + 0 + 32 + 0 + 8 + 4 + 0 + 0 = 172