Google IT Support Professional:The Bits and Bytes of Computer Networking (Week 3) The Transport and Application Layers.

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★The Transport Layer★

Q1.What ordering of TCP flags makes up the Three-way Handshake?

1. FIN, FIN/ACK, ACK
2. SYN, SYN/ACK, ACK
3. SYN, ACK, SYN, ACK
4. SYN, ACK, FIN

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.

Q2.Transport layer protocols, like TCP and UDP, introduce the concept of a port. How many bits is a port field?

1. 4 bits
2. 8 bits
3. 16 bits
4. 32 bits

A TCP or UDP port is a 16-bit number, meaning there are theoretically 65,535 possible values it can have.

Q3.Please select all valid TCP control flags.

1. WAIT
2. LISTEN
3. CLOSE
4. ACK
5. RST
6. URG

Q4.A device that blocks traffic that meets certain criteria is know as a ________.

1. Firewall
2. Router
3. Switch
4. Hub

A firewall is used to block certain defined types of traffic.

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