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
What are three responsibilities of the
transport layer? (Choose three.)
* meeting the reliability
requirements of applications, if
any
* multiplexing multiple
communication streams from
many users or applications on the
same network
* identifying the applications and
services on the client and server
that should handle transmitted
data
* directing packets towards the
destination network
* formatting data into a compatible
form for receipt by the destination
devices
* conducting error detection of the
contents in frames
- meeting the reliability
requirements of applications, if
any - multiplexing multiple
communication streams from
many users or applications on the
same network - identifying the applications and
services on the client and server
that should handle transmitted
data
6.Which three statements describe a
DHCP Discover message? (Choose
three.)
* The source MAC address is 48
ones (FF-FF-FF-FF-FF-FF).
* The destination IP address is
255.255.255.255.
* The message comes from a server
offering an IP address.
* The message comes from a client
seeking an IP address.
* All hosts receive the message, but
only a DHCP server replies.
* Only the DHCP server receives the
message.
- The destination IP address is
255.255.255.255 - The message comes from a client
seeking an IP address. - All hosts receive the message, but
only a DHCP server replies.
.Which two protocols may devices use
in the application process that sends
email? (Choose two.)
* HTTP
* SMTP
* POP
* IMAP
* DNS
* POP3
- SMTP
- DNS
What is true about the Server Message
Block protocol?
* Different SMB message types have
a different format.
* Clients establish a long term
connection to servers.
* SMB messages cannot
authenticate a session.
* SMB uses the FTP protocol for
communication.
- Clients establish a long term
connection to servers.
What is the function of the HTTP GET
message?
* to request an HTML page from a
web server
* to send error information from a
web server to a web client
* to upload content to a web server
from a web client
* to retrieve client email from an
email server using TCP port 110
- to request an HTML page from a
web server
.Which OSI layer provides the interface
between the applications used to
communicate and the underlying
network over which messages are
transmitted?
* application
* presentation
* session
* transport
- application
Which networking model is being used
when an author uploads one chapter
document to a file server of a book
publisher?
* peer-to-peer
* master-slave
* client/server
* point-to-point
- client/server
What do the client/server and peer-topeer network models have in
common?
* Both models have dedicated
servers.
* Both models support devices in
server and client roles.
* Both models require the use of
TCP/IP-based protocols.
* Both models are used only in the
wired network environment.
- Both models support devices in
server and client roles.
In what networking model would
eDonkey, eMule, BitTorrent, Bitcoin,
and LionShare be used?
* peer-to-peer
* client-based
* master-slave
* point-to-point
- peer-to-peer
What is a common protocol that is
used with peer-to-peer applications
such as WireShare, Bearshare, and
Shareaza?
* Ethernet
* Gnutella
* POP
* SMTP
- Gnutella
What is a key characteristic of the
peer-to-peer networking model?
* wireless networking
* social networking without the
Internet
* network printing using a print
server
* resource sharing without a
dedicated server
- resource sharing without a
dedicated server
The application layer of the TCP/IP
model performs the functions of what
three layers of the OSI model?
(Choose three.)
* physical
* session
* network
* presentation
* data link
* transport
* application
- session
- presentation
- application
What is an example of network
communication that uses the clientserver model?
* A user uses eMule to download a
file that is shared by a friend after
the file location is determined.
* A workstation initiates an ARP to
find the MAC address of a receiving
host.
* A user prints a document by using
a printer that is attached to a
workstation of a coworker.
* A workstation initiates a DNS
request when the user types
www.cisco.com in the address bar
of a web browser.
- A workstation initiates a DNS
request when the user types
www.cisco.com in the address bar
of a web browser.
Which layer in the TCP/IP model is
used for formatting, compressing, and
encrypting data?
* internetwork
* session
* presentation
* application
* network access
- application
.What is an advantage of SMB over
FTP?
* Only with SMB can data transfers
occur in both directions.
* Only SMB establishes two
simultaneous connections with
the client, making the data transfer
faster.
* SMB is more reliable than FTP
because SMB uses TCP and FTP
uses UDP.
* SMB clients can establish a longterm connection to the server.
- SMB clients can establish a longterm connection to the server.
. A manufacturing company subscribes
to certain hosted services from its ISP.
The services that are required include
hosted world wide web, file transfer,
and e-mail. Which protocols represent
these three key applications? (Choose
three.)
* FTP
* HTTP
* DNS
* SNMP
* DHCP
* SMTP
- FTP
- HTTP
- SMTP
Which application layer protocol uses
message types such as GET, PUT, and
POST?
* DNS
* DHCP
* SMTP
* HTTP
* POP3
- HTTP
.What type of information is contained
in a DNS MX record?
* the FQDN of the alias used to
identify a service
* the IP address for an FQDN entry
* the domain name mapped to mail
exchange servers
* the IP address of an authoritative
name server
- the domain name mapped to mail
exchange servers
Which three protocols operate at the
application layer of the TCP/IP model?
(Choose three.)
* ARP
* TCP
* UDP
* FTP
* POP3
* DHCP
- FTP
- POP3
- DHCP
Which protocol is used by a client to
communicate securely with a web
server?
* SMTP
* SMB
* IMAP
* HTTPS
- HTTPS
Which applications or services allow
hosts to act as client and server at the
same time?
* client/server applications
* email applications
* P2P applications
* authentication services
- P2P applications
What are two characteristics of peerto-peer networks? (Choose two.)
* scalability
* one way data flow
* decentralized resources
* centralized user accounts
* resource sharing without a
dedicated server
- decentralized resources
- resource sharing without a
dedicated server
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 webbased 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.
- 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.
Which three layers of the OSI model
provide similar network services to
those provided by the application
layer of the TCP/IP model? (Choose
three.)
* physical layer
* session layer
* transport layer
* application layer
* presentation layer
* data link layer
- session layer
- application layer
- presentation layer
A PC that is communicating with a
web server has a TCP window size of
6,000 bytes when sending data and a
packet size of 1,500 bytes. Which byte
of information will the web server
acknowledge after it has received two
packets of data from the PC?
* 3001
* 6001
* 4500
* 6000
- 3001
A PC that is communicating with a
web server has a TCP window size of
6,000 bytes when sending data and a
packet size of 1,500 bytes. Which byte
of information will the web server
acknowledge after it has received
three packets of data from the PC?
* 4501
* 6001
* 6000
* 4500
- 4501
A PC that is communicating with a
web server has a TCP window size of
6,000 bytes when sending data and a
packet size of 1,500 bytes. Which byte
of information will the web server
acknowledge after it has received four
packets of data from the PC?
* 6001
* 3001
* 1501
* 1500
- 6001
. A client creates a packet to send to a
server. The client is requesting TFTP
service. What number will be used as
the destination port number in the
sending packet?
* 69
* 67
* 53
* 80
- 69
A client creates a packet to send to a
server. The client is requesting FTP
service. What number will be used as
the destination port number in the
sending packet?
* 21
* 69
* 67
* 80
- 21
A client creates a packet to send to a
server. The client is requesting SSH
service. What number will be used as
the destination port number in the
sending packet?
* 22
* 69
* 67
* 80
- 22
A client creates a packet to send to a
server. The client is requesting HTTP
service. What number will be used as
the destination port number in the
sending packet?
* 80
* 67
* 53
* 69
- 80
A client creates a packet to send to a
server. The client is requesting POP3
service. What number will be used as
the destination port number in the
sending packet?
* 110
* 67
* 53
* 69
* 443
* 161
* 80
- 110
A client creates a packet to send to a
server. The client is requesting telnet
service. What number will be used as
the destination port number in the
sending packet?
* 23
* 443
* 161
* 110
- 23
A client creates a packet to send to a
server. The client is requesting SNMP
service. What number will be used as
the destination port number in the
sending packet?
* 161
* 443
* 110
* 80
- 161
A client creates a packet to send to a
server. The client is requesting HTTPS
service. What number will be used as
the destination port number in the
sending packet?
* 443
* 161
* 110
* 80
- 443
A client creates a packet to send to a
server. The client is requesting SMTP
service. What number will be used as
the destination port number in the
sending packet?
* 25
* 443
* 161
* 110
- 25
