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Difficulty: MediumCommon Ports and Protocols

Match each enterprise network administrative service or protocol on the left with its corresponding default port number and primary transport layer protocol on the right.

  • Centralized AAA device administration using TACACS+TCP Port 49
  • Exterior gateway routing information exchange using BGPTCP Port 179
  • Lightweight automated firmware delivery using TFTPUDP Port 69
  • Voice over IP (VoIP) call signaling setup using SIPUDP Port 5060

Answer

The correct matches are: TACACS+ corresponds to TCP Port 49; BGP corresponds to TCP Port 179; TFTP corresponds to UDP Port 69; and SIP corresponds to UDP Port 5060.
Each service maps to its precise default port and transport protocol: TACACS+ uses TCP port 49 for administrative access control; BGP uses TCP port 179 for inter-domain routing session maintenance; TFTP uses UDP port 69 for basic configuration transfers; and SIP uses UDP port 5060 for VoIP session management.

Step-by-Step Solution

1
Identify the primary transport layer protocol and default port assigned to TACACS+.
TACACS+ requires reliable transmission over TCP port 49 for network device management.
TACACS+ handles full-payload encryption and requires connection-oriented TCP to prevent lost accounting packets.
2
Determine the transport mechanism and port used by BGP for routing update exchanges.
BGP operates over TCP port 179.
BGP relies on TCP to guarantee ordered, reliable delivery of routing updates between peering routers.
3
Identify the lightweight file transfer protocol (TFTP) specifications.
TFTP uses UDP port 69.
TFTP omits complex authentication and session state overhead, making UDP port 69 ideal for device firmware loading.
4
Select the default session initiation protocol (SIP) port for voice/video signaling.
SIP uses UDP port 5060.
SIP uses UDP port 5060 for unencrypted session setup and tear-down of VoIP sessions.

Key Concept

Standard Service Port and Transport Protocol Mappings
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Topics

Common Ports and Protocols

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