Module 11 - Check on learning Transport Layer Services
Assume a host with IP address 10.1.1.10 wants to request web services from a server at 10.1.1.254. Which of the following would display the correct socket pair?
10.1.1.10:1099, 10.1.1.254:80
Which number or set of numbers represents a socket?
192.168.1.1:80
A client device has initiated a secure HTTP request to a web browser. Which well-known port address number is associated with the destination address?
443
What is the well-known port address number used by DNS to serve requests?
53
A client packet is received by a server. The packet has a destination port number of 67. What service is the client requesting?
DHCP
A client packet is received by a server. The packet has a destination port number of 53. What service is the client requesting?
DNS
A client packet is received by a server. The packet has a destination port number of 21. What service is the client requesting?
FTP
True or False: The Transport Control Protocol (TCP) does not keep track of segments sent to the destination.
False
A client packet is received by a server. The packet has a destination port number of 443. What service is the client requesting?
HTTPS
A client packet is received by a server. The packet has a destination port number of 143. What service is the client requesting?
IMAP
What is a characteristic of UDP?
It provides unreliable delivery of segments
Which protocol operates at the transport layer of the TCP/IP model and ensures reliable delivery of IP packets?
TCP
A client packet is received by a server. The packet has a destination port number of 69. What service is the client requesting?
TFTP
Which action is performed by a client when establishing communication with a server via the use of UDP at the transport layer?
The client randomly selects a source port number
True or False: The User Datagram Protocol (UDP) does not use acknowledgments to track the receipt of segments.
True
Why is UDP well suited as the transport layer protocol for video applications?
UDP has low overhead
Which port group includes port numbers for FTP, HTTP, and TFTP applications?
Well Known Ports
What type of applications are best suited for using UDP?
applications that are sensitive to display
Which Windows command would display the protocols in use, the local address and port numbers, the foreign address and port numbers, and the connection state?
netstat
What protocol header information is used at the transport layer to identify a target application? (The TCP/IP transport layer uses port numbers to identify target applications. Each network application (server or client) has a port number assigned to the application)
port number
Which transport layer information is added to both the TCP and UDP headers? (IP addresses are added to an Internet (IP) header. The ACK flag and window components are only added to a TCP header)
port numbers
A client packet is received by a server. The packet has a destination port number of 110. What service is the client requesting?
POP3
A client packet is received by a server. The packet has a destination port number of 25. What service is the client requesting?
SMTP
A client packet is received by a server. The packet has a destination port number of 161. What service is the client requesting?
SNMP
A client packet is received by a server. The packet has a destination port number of 22. What service is the client requesting?
SSH
What information is used by TCP to reassemble and reorder received segments? (At the transport layer, TCP uses the sequence numbers in the header of each TCP segment to reassemble the segments into the correct order.)
sequence numbers
Which layer of the TCP/IP model is responsible for ensuring packets are sent reliably and any missing packets are resent?
transport layer
What type of port number is assigned by IANA to commonly used services and applications?
well known ports
