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Question

Difficulty: MediumNetworking Ports and Protocols

A network technician is documenting standard firewall port rules for secure management and messaging applications. Match each network protocol on the left with its default port and primary operational role on the right.

  • LDAPSTCP Port 636 — Secure directory service querying over SSL/TLS
  • IMAPSTCP Port 993 — Encrypted email retrieval while keeping messages stored on the server
  • SNMPUDP Port 161 — Querying and collecting diagnostic metrics from network devices
  • SFTPTCP Port 22 — Secure file transfer operating over an SSH tunnel

Answer

LDAPS pairs with TCP Port 636; IMAPS pairs with TCP Port 993; SNMP pairs with UDP Port 161; SFTP pairs with TCP Port 22.
Each protocol correctly aligns with its standard port assignment and primary use case: LDAPS uses TCP 636 for secure directory services, IMAPS uses TCP 993 for secure email retrieval, SNMP uses UDP 161 for device monitoring, and SFTP uses TCP 22 for SSH-based file transfer.

Step-by-Step Solution

1
Identify the port and protocol for directory service access
LDAPS utilizes TCP port 636 to provide secure access to Active Directory and LDAP services.
Standard LDAP operates unencrypted on TCP port 389, whereas LDAPS secures communication over TCP port 636.
2
Identify the port and protocol for secure mail retrieval
IMAPS operates on TCP port 993.
Unencrypted IMAP uses TCP port 143, while IMAPS adds SSL/TLS encryption over TCP port 993.
3
Identify transport protocol and port for network device monitoring
SNMP uses UDP port 161 to poll network devices for status and telemetry.
SNMP communication relies on connectionless UDP transport on port 161 (with SNMP traps sent to UDP port 162).
4
Identify secure file transfer protocol operating over SSH
SFTP uses TCP port 22.
Unlike FTPS (TCP 989/990) or plain FTP (TCP 20/21), SFTP leverages Secure Shell on TCP port 22.

Key Concept

Standard TCP/UDP Port Numbers and Protocol Roles
Estimated Time:1m 30s
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Topics

Networking Ports and Protocols

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