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Question

Difficulty: HardNetworking Ports and Protocols

Match each network administration protocol and port specification on the left with its primary operational use case and security characteristic on the right.

  • TCP 22 (SSH)Encrypted command-line administration and secure file transfer operations
  • UDP 123 (NTP)Clock synchronization across distributed network infrastructure and logging systems
  • TCP 389 (LDAP)Unencrypted querying of directory services databases for user authentication
  • UDP 161 (SNMP)Gathering health metrics, interface statistics, and alert traps from managed hardware

Answer

TCP 22 (SSH) matches Encrypted command-line administration; UDP 123 (NTP) matches Clock synchronization; TCP 389 (LDAP) matches Unencrypted directory queries; UDP 161 (SNMP) matches Gathering health metrics.
TCP port 22 is used by SSH for encrypted console operations and SFTP. UDP port 123 is utilized by NTP to synchronize clocks across log infrastructure. TCP port 389 is the default for unencrypted LDAP directory queries. UDP port 161 is used by SNMP agents to report system status and performance telemetry to network management stations.

Step-by-Step Solution

1
Identify the transport protocol and default port numbers for each administrative service.
SSH corresponds to TCP 22, NTP to UDP 123, standard LDAP to TCP 389, and SNMP to UDP 161.
CompTIA A+ Core 1 requires precise recognition of standard port assignments and transport layer (TCP vs. UDP) behavior.
2
Differentiate between encrypted and unencrypted protocol variants.
SSH (TCP 22) provides encrypted shell access replacing unencrypted Telnet (TCP 23). Standard LDAP (TCP 389) transmits directory lookups in plain text compared to LDAPS (TCP 636).
Distinguishing secure counterparts prevents misconfigurations during firewall access control list (ACL) implementation.
3
Pair each protocol specification with its designated system function.
NTP maintains time synchronization across hosts, SNMP polls device telemetry, LDAP queries user directories, and SSH secures remote terminal management.
Network protocols must be matched to their exact functional roles in enterprise operations.

Key Concept

Standard Network Management Protocols and Port Numbers
Estimated Time:2m 0s
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Topics

Networking Ports and Protocols

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