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Question

Difficulty: HardNetworking Ports and Protocols

A network administrator is creating firewall security policies to audit port assignments and protocol behaviors for key enterprise network services. Match each port number and transport protocol combination on the left with its corresponding network service function on the right.

  • TCP Port 636Secure identity authentication and directory query services encrypted via SSL/TLS
  • UDP Port 69Connectionless bootstrap and firmware file transmission without user authentication
  • TCP Port 445Direct network file and printer sharing directly over TCP/IP networks
  • UDP Port 161Querying system metrics and hardware status from managed network devices

Answer

TCP Port 636 matches Secure identity authentication and directory query services encrypted via SSL/TLS (LDAPS); UDP Port 69 matches Connectionless bootstrap and firmware file transmission without user authentication (TFTP); TCP Port 445 matches Direct network file and printer sharing directly over TCP/IP networks (SMB); UDP Port 161 matches Querying system metrics and hardware status from managed network devices (SNMP).
TCP port 636 provides secure directory services via LDAPS. UDP port 69 handles unauthenticated bootstrap/firmware file transfers via TFTP. TCP port 445 supports direct SMB file and printer sharing over IP. UDP port 161 receives SNMP polling requests for device status metrics.

Step-by-Step Solution

1
Identify secure authentication protocols
LDAP unencrypted operates on TCP 389, whereas encrypted LDAPS uses TCP port 636.
Secure directory services require SSL/TLS binding, which defaults to port 636.
2
Distinguish between file transfer mechanisms
FTP uses TCP ports 20/21 and requires credentials, while TFTP uses UDP port 69 for unauthenticated simple transfers.
TFTP relies on UDP for lightweight overhead when sending router configuration or boot files.
3
Differentiate file sharing and transport protocols
SMB operates natively over TCP port 445 without NetBIOS overhead.
Legacy NetBIOS over TCP/IP used ports 137-139, but modern direct SMB uses TCP 445.
4
Analyze network management port allocations
SNMP queries use UDP port 161, while SNMP trap notifications use UDP port 162.
Device status polling occurs on UDP 161.

Key Concept

Standard Enterprise Ports and Protocol Behaviors
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Topics

Networking Ports and Protocols

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