Networking Cisco

Network Port Reference

Comprehensive reference of common network ports for Network+ and CCNA certifications

Network+

Port Number Protocol Transport Description
20 FTP TCP File Transfer Protocol (Data)
21 FTP TCP File Transfer Protocol (Control)
22 SSH TCP Secure Shell
22 SCP TCP Secure Copy Protocol
22 SFTP TCP SSH File Transfer Protocol
23 Telnet TCP Telnet (Unencrypted remote access)
25 SMTP TCP Simple Mail Transfer Protocol
53 DNS TCP/UDP Domain Name System
67 DHCP UDP Dynamic Host Configuration Protocol (Server)
68 DHCP UDP Dynamic Host Configuration Protocol (Client)
69 TFTP UDP Trivial File Transfer Protocol
80 HTTP TCP Hypertext Transfer Protocol
110 POP3 TCP Post Office Protocol v3
123 NTP UDP Network Time Protocol
137 NetBIOS UDP NetBIOS Name Service
138 NetBIOS UDP NetBIOS Datagram Service
139 NetBIOS TCP NetBIOS Session Service
143 IMAP TCP Internet Message Access Protocol
161 SNMP UDP Simple Network Management Protocol (Agent)
162 SNMP UDP Simple Network Management Protocol (Trap)
389 LDAP TCP Lightweight Directory Access Protocol
443 HTTPS TCP HTTP Secure (HTTP over TLS/SSL)
445 SMB TCP Server Message Block
465 SMTPS TCP SMTP Secure (SMTP over SSL)
514 Syslog UDP System Logging Protocol
587 SMTP TCP SMTP (Message Submission)
636 LDAPS TCP LDAP Secure (LDAP over SSL)
993 IMAPS TCP IMAP Secure (IMAP over SSL)
995 POP3S TCP POP3 Secure (POP3 over SSL)
1433 SQL Server TCP Microsoft SQL Server
1521 Oracle TCP Oracle Database
3306 MySQL TCP MySQL Database
3389 RDP TCP Remote Desktop Protocol
5060 SIP TCP/UDP Session Initiation Protocol (Unencrypted)
5061 SIP TCP Session Initiation Protocol (Encrypted)
5432 PostgreSQL TCP PostgreSQL Database

CCNA

Common TCP/UDP Ports

Port Number Protocol Transport Description
20 FTP TCP File Transfer Protocol (Data)
21 FTP TCP File Transfer Protocol (Control)
22 SSH TCP Secure Shell
23 Telnet TCP Telnet (Unencrypted remote access)
25 SMTP TCP Simple Mail Transfer Protocol
53 DNS TCP/UDP Domain Name System
67 DHCP UDP Dynamic Host Configuration Protocol (Server)
68 DHCP UDP Dynamic Host Configuration Protocol (Client)
69 TFTP UDP Trivial File Transfer Protocol
80 HTTP TCP Hypertext Transfer Protocol
110 POP3 TCP Post Office Protocol v3
123 NTP UDP Network Time Protocol
143 IMAP TCP Internet Message Access Protocol
161 SNMP UDP Simple Network Management Protocol (Get/Set)
162 SNMP UDP Simple Network Management Protocol (Trap)
179 BGP TCP Border Gateway Protocol
389 LDAP TCP Lightweight Directory Access Protocol
443 HTTPS TCP HTTP Secure (HTTP over TLS/SSL)
445 SMB TCP Server Message Block
514 Syslog UDP System Logging Protocol
636 LDAPS TCP LDAP Secure (LDAP over SSL)
1812 RADIUS UDP RADIUS Authentication
1813 RADIUS UDP RADIUS Accounting
1985 HSRP UDP Hot Standby Router Protocol
3389 RDP TCP Remote Desktop Protocol
49 TACACS+ TCP Terminal Access Controller Access-Control System Plus

Network Layer Protocols (IP Protocol Numbers)

Protocol Number Protocol Description
1 ICMP Internet Control Message Protocol
2 IGMP Internet Group Management Protocol
6 TCP Transmission Control Protocol
17 UDP User Datagram Protocol
41 IPv6 IPv6 Encapsulation
47 GRE Generic Routing Encapsulation
50 ESP Encapsulating Security Payload (IPSec)
51 AH Authentication Header (IPSec)
88 EIGRP Enhanced Interior Gateway Routing Protocol
89 OSPF Open Shortest Path First
103 PIM Protocol Independent Multicast
115 L2TP Layer 2 Tunneling Protocol
EtherType Protocol Description
0x0800 IPv4 Internet Protocol version 4
0x0806 ARP Address Resolution Protocol
0x86DD IPv6 Internet Protocol version 6
0x8100 802.1Q VLAN Tagging
0x88CC LLDP Link Layer Discovery Protocol
0x8847 MPLS Multiprotocol Label Switching (Unicast)
0x8848 MPLS Multiprotocol Label Switching (Multicast)

Cisco Proprietary Protocols

Protocol Port/Type Description
CDP Layer 2 Cisco Discovery Protocol
VTP Layer 2 VLAN Trunking Protocol
DTP Layer 2 Dynamic Trunking Protocol
PVST+ Layer 2 Per-VLAN Spanning Tree Plus
EIGRP IP Protocol 88 Enhanced Interior Gateway Routing Protocol
HSRP UDP 1985 Hot Standby Router Protocol
GLBP UDP 3222 Gateway Load Balancing Protocol

Spanning Tree Protocol Versions

Protocol Standard Description
STP 802.1D Spanning Tree Protocol (Original)
RSTP 802.1w Rapid Spanning Tree Protocol
MSTP 802.1s Multiple Spanning Tree Protocol
PVST+ Cisco Per-VLAN Spanning Tree Plus
Rapid PVST+ Cisco Rapid Per-VLAN Spanning Tree Plus

Routing Protocols

Protocol Type Metric Transport
RIP Distance Vector Hop Count UDP 520
RIPv2 Distance Vector Hop Count UDP 520
RIPng Distance Vector (IPv6) Hop Count UDP 521
EIGRP Hybrid/Advanced DV Composite IP Protocol 88
OSPF Link State Cost IP Protocol 89
OSPFv3 Link State (IPv6) Cost IP Protocol 89
BGP Path Vector Path Attributes TCP 179
IS-IS Link State Cost Layer 2

First Hop Redundancy Protocols (FHRP)

Protocol Type Virtual MAC Multicast Address
HSRP v1 Cisco 0000.0c07.acXX 224.0.0.2
HSRP v2 Cisco 0000.0c9f.fXXX 224.0.0.102
VRRP Standard 0000.5e00.01XX 224.0.0.18
GLBP Cisco 0007.b400.XXYY 224.0.0.102

Network Services & Management

Protocol Port Transport Description
NTP 123 UDP Network Time Protocol
SNMP 161 UDP Get/Set Requests
SNMP Trap 162 UDP Notifications
Syslog 514 UDP System Logging
NetFlow 2055 UDP Network Traffic Flow Data
RADIUS Auth 1812 UDP Authentication
RADIUS Acct 1813 UDP Accounting
TACACS+ 49 TCP AAA Protocol