FTP (FileTransfer Protocol) is used to transfer files between a remote server and a local host, and is a general protocol for transferring files on an IP network.

Wi-Fi 6 and 5G technologies will play an increasingly important role in the future, but enterprises will still tend to use Wi Fi 6 to create internal connections.

The Cisco Dynamic Trunking Protocol DTP is all the protocols of Cisco in the  VLAN group. It is mainly used to negotiate the trunking process and trunk encapsulation 802.1Q type on the link between two devices. DTP is cisco's proprietary protocol. 

Today we will review and self-check the brief description of the EIGRP protocol DUAL dispersion update algorithm.

Problems caused by traditional VPN

1. Too many VPNs make maintenance difficult and take up more equipment performance

Use UDP packets

Both source and destination ports are UDP 646

R1#show mpls ldp discovery Verifies whether the other party's LDP hello is received

SMTP is a protocol that provides reliable and effective email transmission. SMTP is a mail service built on the FTP file transfer service. 

Today I will talk about Cisco CGMP and RGMP. CGMP is used to limit multicast traffic on Layer 2 networks. Because the switch cannot view Layer 3 data packets, and cannot distinguish between IGMP packets.

I saw that there are various protocols written in some message format encyclopedias, but there is no protocol for these dialogues. Is it because they belong to different levels? However, there are also some application layer protocols such as SNMP. Is it the difference between routing protocols?