10.6

Question 1

What are two characteristics shared by TCP and UDP? (Choose two.)
	default window size
	connectionless communication
	port numbering
	3-way handshake
	ability to to carry digitized voice
	use of checksum

Answer 1

 port numbering*

 use of checksum*

Question 2

Why are port numbers included in the TCP header of a segment?
 to indicate the correct router interface that should be used to forward a segment
 to identify which switch ports should receive or forward the segment
 to determine which Layer 3 protocol should be used to encapsulate the data
 to enable a receiving host to forward the data to the appropriate application
 to allow the receiving host to assemble the packet in the proper order

Answer 2

 to enable a receiving host to forward the data to the appropriate application*

Question 3

Refer to the exhibit. Consider the IP address of 192.168.10.0/24 that has been assigned to a high school building. The largest network in this building has 100 devices. If 192.168.10.0 is the network number for the largest network, what would be the network number for the next largest network, which has 40 devices?

	192.168.10.0
	192.168.10.128
	192.168.10.192
	192.168.10.224
	192.168.10.240

Answer 3

 192.168.10.128*

Question 4

Which statement is true about variable-length subnet masking?
 Each subnet is the same size.
 The size of each subnet may be different, depending on requirements.
 Subnets may only be subnetted one additional time.
 Bits are returned, rather than borrowed, to create additional subnets.

Answer 4

 The size of each subnet may be different, depending on requirements.*

Question 5

In what two situations would UDP be the preferred transport protocol over TCP? (Choose two.)
 when applications need to guarantee that a packet arrives intact, in sequence, and unduplicated
 when a faster delivery mechanism is needed
 when delivery overhead is not an issue
 when applications do not need to guarantee delivery of the data
 when destination port numbers are dynamic

Answer 5

 when a faster delivery mechanism is needed*

 when applications do not need to guarantee delivery of the data*

Question 6

What important information is added to the TCP/IP transport layer header to ensure communication and connectivity with a remote network device?
 timing and synchronization
 destination and source port numbers
 destination and source physical addresses
 destination and source logical network addresses

Answer 6

 destination and source port numbers*

Question 7

What is the TCP mechanism used in congestion avoidance?
	three-way handshake
	socket pair
	two-way handshake
	sliding window

Answer 7

 sliding window*

Question 8

58. Which scenario describes a function provided by the transport layer?
     A student is using a classroom VoIP phone to call home. The unique identifier burned into the phone is a transport layer address used to contact another network device on the same network.
     A student is playing a short web-based movie with sound. The movie and sound are encoded within the transport layer header.
     A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window.
     A corporate worker is accessing a web server located on a corporate network. The transport layer formats the screen so the web page appears properly no matter what device is being used to view the web site.

Answer 8

 A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window.*

Question 9

59.	A user opens three browsers on the same PC to access www.cisco.com to search for certification course information. The Cisco web server sends a datagram as a reply to the request from one of the web browsers. Which information is used by the TCP/IP protocol stack in the PC to identify which of the three web browsers should receive the reply?
	the destination IP address
	the destination port number
	the source IP address
	the source port number

Answer 9

 the destination port number*

Question 10

What are two ways that TCP uses the sequence numbers in a segment? (Choose two.)
 to identify missing segments at the destination
 to reassemble the segments at the remote location
 to specify the order in which the segments travel from source to destination
 to limit the number of segments that can be sent out of an interface at one time
 to determine if the packet changed during transit

Answer 10

 to identify missing segments at the destination *

 to reassemble the segments at the remote location*