The Bits and Bytes of Computer
Networking. Week 3: The Transport and
Application Layers Already Passed
What ordering of TCP flags makes up the Three-way Handshake? ✔✔SYN, SYN/ACK, ACK;
The computer that wants to establish a connection sends a packet with the SYN flag set. Then,
the server responds with a packet with both the SYN and ACK flags set. Finally, the original
computer sends a packet with just the ACK flag set.
Transport layer protocols, like TCP and UDP, introduce the concept of a port. How many bits is
a port field? ✔✔16 bits; A TCP or UDP port is a 16-bit number, meaning there are theoretically
65,535 possible values it can have.
Please select all valid TCP control flags.
WAIT, URG, ACK, LISTEN, RST, CLOSE ✔✔RST, ACK, URG
A device that blocks traffic that meets certain criteria is know as a ________. ✔✔Firewall; A
firewall is used to block certain defined types of traffic.
, Unlike our five-layer model, the OSI network model adds two more layers on top of the
Application Layer. Select examples of these new layers below. ✔✔The presentation layer; The
presentation layer might handle things like compression or encryption.
the session layer; The session layer handles delivery of data from the transport layer to
applications themselves.
An example of something that operates at the application layer is: ✔✔a web browser; Web
browsers and server operate at the application layer.
What's the standard number for a TTL field? ✔✔64; While this value can be set to anything from
0 to 255, 64 is the recommended standard.
Ports 1-1023 are known as ______ ports. ✔✔system; System ports are used for very well-known
services.
If the transmitting device would like for the receiving device to push currently buffered data to
the application on the receiving end immediately, it would set the ____ flag. ✔✔PSH; The PSH
flag ensures that the receiving end doesn't wait for any further data.
Networking. Week 3: The Transport and
Application Layers Already Passed
What ordering of TCP flags makes up the Three-way Handshake? ✔✔SYN, SYN/ACK, ACK;
The computer that wants to establish a connection sends a packet with the SYN flag set. Then,
the server responds with a packet with both the SYN and ACK flags set. Finally, the original
computer sends a packet with just the ACK flag set.
Transport layer protocols, like TCP and UDP, introduce the concept of a port. How many bits is
a port field? ✔✔16 bits; A TCP or UDP port is a 16-bit number, meaning there are theoretically
65,535 possible values it can have.
Please select all valid TCP control flags.
WAIT, URG, ACK, LISTEN, RST, CLOSE ✔✔RST, ACK, URG
A device that blocks traffic that meets certain criteria is know as a ________. ✔✔Firewall; A
firewall is used to block certain defined types of traffic.
, Unlike our five-layer model, the OSI network model adds two more layers on top of the
Application Layer. Select examples of these new layers below. ✔✔The presentation layer; The
presentation layer might handle things like compression or encryption.
the session layer; The session layer handles delivery of data from the transport layer to
applications themselves.
An example of something that operates at the application layer is: ✔✔a web browser; Web
browsers and server operate at the application layer.
What's the standard number for a TTL field? ✔✔64; While this value can be set to anything from
0 to 255, 64 is the recommended standard.
Ports 1-1023 are known as ______ ports. ✔✔system; System ports are used for very well-known
services.
If the transmitting device would like for the receiving device to push currently buffered data to
the application on the receiving end immediately, it would set the ____ flag. ✔✔PSH; The PSH
flag ensures that the receiving end doesn't wait for any further data.
