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Questions and Answers
What is the total number of ports available?
What is the total number of ports available?
Which ports are called the well-known ports?
Which ports are called the well-known ports?
What is the combination of host's IP address and port number known as?
What is the combination of host's IP address and port number known as?
Which protocol uses port 25?
Which protocol uses port 25?
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Which protocol uses port 80?
Which protocol uses port 80?
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Which protocol uses port 22?
Which protocol uses port 22?
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Which protocol uses ports 137-139?
Which protocol uses ports 137-139?
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Which protocol uses port 443?
Which protocol uses port 443?
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Where can a complete list of registered port numbers be found?
Where can a complete list of registered port numbers be found?
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Which protocol at the Host-to-Host layer guarantees packet delivery through the use of a virtual circuit and data acknowledgements?
Which protocol at the Host-to-Host layer guarantees packet delivery through the use of a virtual circuit and data acknowledgements?
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What is a key difference between TCP and UDP?
What is a key difference between TCP and UDP?
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What is the main reason why UDP is often considered to be somewhat faster than TCP?
What is the main reason why UDP is often considered to be somewhat faster than TCP?
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What concept is used by TCP and UDP to keep track of conversations and ensure data reaches the right application and end user?
What concept is used by TCP and UDP to keep track of conversations and ensure data reaches the right application and end user?
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Which layer of the TCP/IP suite includes TCP and UDP protocols?
Which layer of the TCP/IP suite includes TCP and UDP protocols?
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What is the port number commonly used for HTTP requests?
What is the port number commonly used for HTTP requests?
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In the analogy provided, what does the IP address represent?
In the analogy provided, what does the IP address represent?
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What is the term used to describe the characteristic of TCP that ensures packet delivery?
What is the term used to describe the characteristic of TCP that ensures packet delivery?
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What does UDP lack in comparison to TCP, leading to its faster speed?
What does UDP lack in comparison to TCP, leading to its faster speed?
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TCP guarantees packet delivery through the use of a virtual circuit and data acknowledgements.
TCP guarantees packet delivery through the use of a virtual circuit and data acknowledgements.
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UDP is always faster than TCP due to its connectionless nature.
UDP is always faster than TCP due to its connectionless nature.
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TCP is often referred to as connectionless, whereas UDP is connection-oriented.
TCP is often referred to as connectionless, whereas UDP is connection-oriented.
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TCP and UDP use port numbers to keep track of conversations and ensure data reaches the right application and end user.
TCP and UDP use port numbers to keep track of conversations and ensure data reaches the right application and end user.
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In the analogy provided, the IP address is compared to the cable company.
In the analogy provided, the IP address is compared to the cable company.
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UDP does not guarantee packet delivery.
UDP does not guarantee packet delivery.
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Both TCP and UDP are alternatives within the TCP/IP suite.
Both TCP and UDP are alternatives within the TCP/IP suite.
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TCP guarantees packet delivery through the use of a virtual circuit and data acknowledgements, while UDP does not offer any guarantees.
TCP guarantees packet delivery through the use of a virtual circuit and data acknowledgements, while UDP does not offer any guarantees.
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TCP and UDP make use of port numbers to direct data to the correct application and end user.
TCP and UDP make use of port numbers to direct data to the correct application and end user.
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TCP and UDP applications combine the host’s IP address with the port number in order to communicate. This combination is known as a socket.
TCP and UDP applications combine the host’s IP address with the port number in order to communicate. This combination is known as a socket.
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The well-known ports are numbered from 0 to 1023.
The well-known ports are numbered from 0 to 1023.
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Any port number from 49152 to 65535 can be used by application vendors.
Any port number from 49152 to 65535 can be used by application vendors.
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HTTP uses port number 80 for communication.
HTTP uses port number 80 for communication.
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The total number of ports available is 65,536.
The total number of ports available is 65,536.
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Telnet uses UDP for communication.
Telnet uses UDP for communication.
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The combination of host's IP address and port number is known as a socket.
The combination of host's IP address and port number is known as a socket.
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SMTP uses TCP for communication.
SMTP uses TCP for communication.
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SNMP uses port numbers 161 and 162 for communication.
SNMP uses port numbers 161 and 162 for communication.
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Explain the purpose of port numbers in the context of TCP/IP applications.
Explain the purpose of port numbers in the context of TCP/IP applications.
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What is a socket in the context of TCP/IP applications?
What is a socket in the context of TCP/IP applications?
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What are the well-known ports and how are they defined?
What are the well-known ports and how are they defined?
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Explain the significance of the registered ports in TCP/IP applications.
Explain the significance of the registered ports in TCP/IP applications.
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What is the purpose of the ports numbered from 49152 to 65535?
What is the purpose of the ports numbered from 49152 to 65535?
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What is the total number of ports available in TCP/IP applications?
What is the total number of ports available in TCP/IP applications?
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Where can a complete list of registered port numbers be found?
Where can a complete list of registered port numbers be found?
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How do TCP/IP applications combine the host's IP address with the port number?
How do TCP/IP applications combine the host's IP address with the port number?
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What is the role of port numbers in ensuring effective communication between client computers and servers?
What is the role of port numbers in ensuring effective communication between client computers and servers?
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What are the two alternatives within the TCP/IP suite at the Host-to-Host layer?
What are the two alternatives within the TCP/IP suite at the Host-to-Host layer?
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What is the major difference between TCP and UDP?
What is the major difference between TCP and UDP?
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What is the purpose of port numbers in TCP and UDP?
What is the purpose of port numbers in TCP and UDP?
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What analogy is provided to understand port numbers?
What analogy is provided to understand port numbers?
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What is the term used to describe TCP's characteristic of ensuring packet delivery?
What is the term used to describe TCP's characteristic of ensuring packet delivery?
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Why is UDP often considered to be somewhat faster than TCP?
Why is UDP often considered to be somewhat faster than TCP?
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What protocol uses port 80 for communication?
What protocol uses port 80 for communication?
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What is the layer of the TCP/IP suite that includes TCP and UDP protocols?
What is the layer of the TCP/IP suite that includes TCP and UDP protocols?
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What does UDP lack in comparison to TCP, leading to its faster speed?
What does UDP lack in comparison to TCP, leading to its faster speed?
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TCP guarantees packet delivery through the use of a virtual circuit and data acknowledgements, while _____________ does not offer any guarantees.
TCP guarantees packet delivery through the use of a virtual circuit and data acknowledgements, while _____________ does not offer any guarantees.
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UDP is _____________, whereas TCP is connection-oriented.
UDP is _____________, whereas TCP is connection-oriented.
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TCP and UDP use _____________ to keep track of these conversations and make sure that the data gets to the right application and right end user.
TCP and UDP use _____________ to keep track of these conversations and make sure that the data gets to the right application and right end user.
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In this analogy, the IP address is your _____________.
In this analogy, the IP address is your _____________.
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Imagine a web server that is managing connections from incoming users who are viewing web content and others who are downloading files. TCP and UDP use port numbers to keep track of these conversations and make sure that the data gets to the right application and right end ____________.
Imagine a web server that is managing connections from incoming users who are viewing web content and others who are downloading files. TCP and UDP use port numbers to keep track of these conversations and make sure that the data gets to the right application and right end ____________.
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Conversely, when a client makes a request of a server, it needs to do so on a specific port to make sure that the right application on the server hears the _____________.
Conversely, when a client makes a request of a server, it needs to do so on a specific port to make sure that the right application on the server hears the _____________.
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A good analogy for understanding port numbers is to think of cable or satellite television. In this analogy, the IP address is your _____________.
A good analogy for understanding port numbers is to think of cable or satellite television. In this analogy, the IP address is your _____________.
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TCP guarantees packet delivery through the use of a virtual circuit and data acknowledgements and _____________ does not.
TCP guarantees packet delivery through the use of a virtual circuit and data acknowledgements and _____________ does not.
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TCP is often referred to as connection-oriented, whereas _____________ is connectionless.
TCP is often referred to as connection-oriented, whereas _____________ is connectionless.
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Ports 0 through 1023 are called the well-known ports and are assigned to commonly used services, and 1024 through 49151 are called the ______ ports. Anything from 49152 to 65535 is free to be used by application vendors. Fortunately, you don’t need to memorize them all.
Ports 0 through 1023 are called the well-known ports and are assigned to commonly used services, and 1024 through 49151 are called the ______ ports. Anything from 49152 to 65535 is free to be used by application vendors. Fortunately, you don’t need to memorize them all.
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The client computer on a network knows that if it needs to ask a question in HTTP, it needs to do it on port ______.
The client computer on a network knows that if it needs to ask a question in HTTP, it needs to do it on port ______.
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TCP/IP applications combine the host’s IP address with the port number in order to communicate. This combination is known as a ______.
TCP/IP applications combine the host’s IP address with the port number in order to communicate. This combination is known as a ______.
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Table 7.1 shows the ports used by some of the more common protocols. You should know each of these for the A+ exam. Table 7.1 Common port numbers Service Protocol Port(s) FTP TCP 20, 21 SSH TCP 22 Telnet TCP 23 SMTP TCP 25 DNS TCP/UDP 53 DHCP UDP 67, 68 HTTP TCP ______ POP3 TCP 110 NetBIOS/NetBT TCP 137–139 IMAP4 TCP 143 SNMP UDP 161, 162 LDAP TCP 389 SLP TCP 427 HTTPS TCP 443 SMB/CIFS TCP 445 AFP TCP 548 RDP TCP 3389 375 A complete list of registered port numbers can be found at www.iana.org and several other sites, such as Wikipedia.
Table 7.1 shows the ports used by some of the more common protocols. You should know each of these for the A+ exam. Table 7.1 Common port numbers Service Protocol Port(s) FTP TCP 20, 21 SSH TCP 22 Telnet TCP 23 SMTP TCP 25 DNS TCP/UDP 53 DHCP UDP 67, 68 HTTP TCP ______ POP3 TCP 110 NetBIOS/NetBT TCP 137–139 IMAP4 TCP 143 SNMP UDP 161, 162 LDAP TCP 389 SLP TCP 427 HTTPS TCP 443 SMB/CIFS TCP 445 AFP TCP 548 RDP TCP 3389 375 A complete list of registered port numbers can be found at www.iana.org and several other sites, such as Wikipedia.
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