52 Chapter 2 ■ System Fundamentals
- Hubs operate at what layer of the OSI model?
A. Layer 1
B. Layer 2
C. Layer 3
D. Layer 4 - What is the proper sequence of the TCP three-way-handshake?
A. SY N-ACK, ACK, ACK
B. SY N, SY N-ACK, ACK
C. SYN-SYN, SYN-ACK, SYN
D. ACK, SY N-ACK, SY N - Which of these protocols is a connection-oriented protocol?
A. FTP
B. UDP
C. POP3
D. TCP - A scan of a network client shows that port 23 is open; what protocol is this aligned with?
A. Tel net
B. NetBIOS
C. DNS
D. SMTP - What port range is an obscure third-party application most likely to use?
A. 1 to 1024
B. 1025 to 32767
C. 32768 to 49151
D. 49152 to 65535 - Which category of firewall filters is based on packet header data only?
A. Stateful
B. Application
C. Packet
D. Proxy