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Difficulty: EasyCommon Ports and Protocols

A network administrator is reviewing default firewall port permissions for common infrastructure protocols. Match each network service description on the left with its corresponding default port assignment and transport layer protocol on the right.

  • Host name to IP address resolution serviceUDP/TCP Port 53
  • Secure encrypted command-line remote administrationTCP Port 22
  • Outbound server-to-server email transmissionTCP Port 25
  • Encrypted web session traffic over TLSTCP Port 443

Answer

The correct pairings are: Host name to IP address resolution service matches UDP/TCP Port 53; Secure encrypted command-line remote administration matches TCP Port 22; Outbound server-to-server email transmission matches TCP Port 25; Encrypted web session traffic over TLS matches TCP Port 443.
Each service uses standard well-known port definitions: DNS name resolution uses UDP/TCP port 53; SSH encrypted remote administration uses TCP port 22; SMTP email relaying uses TCP port 25; HTTPS encrypted web communication uses TCP port 443.

Step-by-Step Solution

1
Identify the standard protocol associated with each service description.
Host name resolution corresponds to DNS; secure CLI administration corresponds to SSH; outbound mail relay corresponds to SMTP; secure web traffic corresponds to HTTPS.
Service descriptions directly reflect the fundamental functions of standard Network+ core protocols.
2
Map each protocol to its standard IANA default port assignment and transport protocol.
DNS maps to UDP/TCP port 53, SSH maps to TCP port 22, SMTP maps to TCP port 25, and HTTPS maps to TCP port 443.
These default well-known port allocations are standardized for enterprise firewall and ACL rules.

Key Concept

Standard IANA well-known port assignments and transport layer mechanisms for core network services.
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Topics

Common Ports and Protocols

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