Module 14-15 Exam Flashcards
Which transport layer feature is used
to guarantee session establishment?
* UDP ACK flag
* TCP 3-way handshake
* UDP sequence number
* TCP port number
- TCP 3-way handshake
Which action is performed by a client
when establishing communication
with a server via the use of UDP at the
transport layer?
* The client sets the window size for
the session.
* The client sends an ISN to the
server to start the 3-way
handshake.
* The client randomly selects a
source port number.
* The client sends a synchronization
segment to begin the session.
- The client randomly selects a
source port number.
What is the complete range of TCP
and UDP well-known ports?
* 0 to 255
* 0 to 1023
* 256 – 1023
* 1024 – 49151
- 0 to 1023
What is a socket?
* the combination of the source and
destination IP address and source
and destination Ethernet address
* the combination of a source IP
address and port number or a
destination IP address and port
number
* the combination of the source and
destination sequence and
acknowledgment numbers
* the combination of the source and
destination sequence numbers
and port numbers
- the combination of a source IP
address and port number or a
destination IP address and port
number
A PC is downloading a large file from a
server. The TCP window is 1000 bytes.
The server is sending the file using
100-byte segments. How many
segments will the server send before it
requires an acknowledgment from the
PC?
* 1 segment
* 10 segments
* 100 segments
* 1000 segments
- 10 segments
Which factor determines TCP window
size?
* the amount of data to be
transmitted
* the number of services included in
the TCP segment
* the amount of data the destination
can process at one time
* the amount of data the source is
capable of sending at one time
- the amount of data the destination
can process at one time
What does a client do when it has UDP
datagrams to send?
* It just sends the datagrams.
* It queries the server to see if it is
ready to receive data.
* It sends a simplified three-way
handshake to the server.
* It sends to the server a segment
with the SYN flag set to
synchronize the conversation.
- It just sends the datagrams.
Which three fields are used in a UDP
segment header? (Choose three.)
* Window Size
* Length
* Source Port
* Acknowledgment Number
* Checksum
* Sequence Number
- Length
- Source Port
- Checksum
What are two roles of the transport
layer in data communication on a
network? (Choose two.)
* identifying the proper application
for each communication stream
* tracking the individual
communication between
applications on the source and
destination hosts
* providing frame delimiting to
identify bits making up a frame
* performing a cyclic redundancy
check on the frame for errors
* providing the interface between
applications and the underlying
network over which messages are
transmitted
- identifying the proper application
for each communication stream - tracking the individual
communication between
applications on the source and
destination hosts
What information is used by TCP to
reassemble and reorder received
segments?
* port numbers
* sequence numbers
* acknowledgment numbers
* fragment numbers
- sequence numbers
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
- destination and source port
numbers
Which two characteristics are
associated with UDP sessions?
(Choose two.)
* Destination devices receive traffic
with minimal delay.
* Transmitted data segments are
tracked.
* Destination devices reassemble
messages and pass them to an
application.
* Received data is unacknowledged.
* Unacknowledged data packets are
retransmitted.
- Destination devices receive traffic
with minimal delay. - Received data is unacknowledged.
Which flag in the TCP header is used
in response to a received FIN in order
to terminate connectivity between two
network devices?
* FIN
* ACK
* SYN
* RST
- ACK
Which protocol or service uses UDP
for a client-to-server communication
and TCP for server-to-server
communication?
* HTTP
* FTP
* DNS
* SMTP
- DNS
What is a characteristic of UDP?
* UDP datagrams take the same
path and arrive in the correct order
at the destination.
* Applications that use UDP are
always considered unreliable.
* UDP reassembles the received
datagrams in the order they were
received.
* UDP only passes data to the
network when the destination is
ready to receive the data.
- UDP reassembles the received
datagrams in the order they were
received.
.What kind of port must be requested
from IANA in order to be used with a
specific application?
* registered port
* private port
* dynamic port
* source port
- registered port
Which three application layer
protocols use TCP? (Choose three.)
* SMTP
* FTP
* SNMP
* HTTP
* TFTP
* DHCP
- SMTP
- FTP
- HTTP
Which three statements characterize
UDP? (Choose three.)
* UDP provides basic
connectionless transport layer
functions.
* UDP provides connectionoriented, fast transport of data at
Layer 3.
* UDP relies on application layer
protocols for error detection.
* UDP is a low overhead protocol
that does not provide sequencing
or flow control mechanisms.
* UDP relies on IP for error detection
and recovery.
* UDP provides sophisticated flow
control mechanisms.
- UDP provides basic
connectionless transport layer
functions. - UDP relies on application layer
protocols for error detection. - UDP is a low overhead protocol
that does not provide sequencing
or flow control mechanisms.
Which two fields are included in the
TCP header but not in the UDP
header? (Choose two.)
* window
* checksum
* source port
* destination port
* sequence number
- window
- sequence number
Which field in the TCP header
indicates the status of the three-way
handshake process?
* window
* reserved
* checksum
* control bits
- control bits
Why does HTTP use TCP as the
transport layer protocol?
* to ensure the fastest possible
download speed
* because HTTP is a best-effort
protocol
* because transmission errors can
be tolerated easily
* because HTTP requires reliable
delivery
- because HTTP requires reliable
delivery
Which two types of applications are
best suited for UDP? (Choose two.)
* applications that need data flow
control
* applications that require reliable
delivery
* applications that handle reliability
themselves
* applications that need the
reordering of segments
* applications that can tolerate
some data loss, but require little or
no delay
- applications that handle reliability
themselves - applications that can tolerate
some data loss, but require little or
no delay
How are port numbers used in the
TCP/IP encapsulation process?
* Source port numbers and
destination port numbers are not
necessary when UDP is the
transport layer protocol being used
for the communication.
* Source port and destination port
numbers are randomly generated.
* If multiple conversations occur
that are using the same service,
the source port number is used to
track the separate conversations.
* Destination port numbers are
assigned automatically and
cannot be changed.
- If multiple conversations occur
that are using the same service,
the source port number is used to
track the separate conversations.
. In what two situations would UDP be
better than TCP as the preferred
transport protocol? (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
- when a faster delivery mechanism
is needed - when applications do not need to
guarantee delivery of the data
