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Question

Difficulty: HardNetworking Ports and Protocols

A network technician is configuring service-specific firewall rules and remote client connections for an enterprise infrastructure. Match each network service requirement on the left with its corresponding default transport protocol and port number on the right.

  • Encrypted directory service authentication and user queries using SSL/TLS (LDAPS)TCP Port 636
  • Unauthenticated, connectionless firmware transfer for switch network booting (TFTP)UDP Port 69
  • Encrypted email retrieval protocol maintaining server-side synchronization (IMAPS)TCP Port 993
  • Automated network service discovery protocol for locating LAN resources (SLP)TCP/UDP Port 427

Answer

LDAPS matches TCP Port 636; TFTP matches UDP Port 69; IMAPS matches TCP Port 993; SLP matches TCP/UDP Port 427.
Each protocol correctly aligns with its default transport layer protocol and assigned port number according to standard CompTIA A+ networking specifications.

Step-by-Step Solution

1
Identify the protocol and port for directory service security.
LDAPS operates over TCP port 636.
Security requirements mandate encrypted directory traffic using SSL/TLS rather than unencrypted LDAP on port 389.
2
Determine the transport protocol and port for simple boot file loading.
TFTP operates over UDP port 69.
TFTP uses UDP to eliminate connection overhead for lightweight firmware and boot image loading.
3
Identify the encrypted mailbox retrieval protocol and port.
IMAPS operates over TCP port 993.
IMAPS secures IMAP communications over TLS/SSL while keeping mail stored on the server.
4
Match the local network service discovery protocol.
SLP operates over TCP/UDP port 427.
SLP allows network devices to announce and locate local services over port 427.

Key Concept

Standard Network Protocols and Associated Default Ports
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Topics

Networking Ports and Protocols

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