The course covers transport protocols (IPv4, IPv6, UDP, TCP, DCCP, TFRC, etc.), protocols for working with names and addresses (ARP, DNS, DHCP, NAT, etc.), basic application protocols HTTP, RTPRTCP, as well as algorithms and routing protocols (RR IP, OSPF, BGP, LDP, PIM, etc.). Label switched protocols (MPLS and GMPLS) are described. The course is a guide to the protocols and is aimed at students specializing in the field of information transfer, specialists who are interested in these problems, as well as a wide range of readers who would like to understand this.