Cisco Certified Network Associate (CCNA) Practice Exam

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Study for the Cisco Certified Network Associate (CCNA) exam with our comprehensive quiz featuring multiple-choice questions and detailed explanations. Prepare effectively and enhance your understanding of networking concepts!

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To match FTP traffic in an ACL, which transport layer protocol is applicable?

UDP
ICMP
TCP
SCTP

The correct answer is: TCP

To match FTP traffic in an Access Control List (ACL), the applicable transport layer protocol is TCP. FTP (File Transfer Protocol) operates over TCP because it requires a reliable connection for data transfer. TCP, being a connection-oriented protocol, ensures that packets are delivered in order and without errors, which is crucial for the integrity and reliability of file transfers. FTP typically uses two ports: one for command control (commonly port 21) and another for data transfer, which can vary based on the mode of FTP (active or passive). Since ACLs are often implemented at a network device level, they need to filter and match traffic based on the specific layer 4 protocols, and TCP is the protocol used for FTP. Understanding the specific protocol used by FTP helps in effectively configuring security policies and managing network traffic. Other protocols such as UDP and ICMP do not provide the necessary connection-oriented features required for FTP, while SCTP, although capable of supporting file transfers, is not commonly used with FTP. Hence, TCP is the right choice for filtering FTP traffic in ACL configurations.