A content subject similar to the subject "Computer Networks", of the Bachelor in Informatics Engineering of the UC3M.

The objective of this subject is to study advanced aspects of the protocols that support the Internet, in particular the advanced aspects of the transport layer, security and the main application-layer protocols of the Internet: DNS, email, file transfer , remote terminal, web and others. After taking the course, the student must: - Understand the advanced functions of transport protocols (for example, TCP congestion and flow control mechanisms). - Know the basic principles of cryptography and encryption, symmetric and public key algorithms, digital signature, message summary, public key infrastructure, security in transport level communications (TLS) and application. - Know the messages and basic formats, operation, and architecture of the different application-level protocols dealt with by the subject: name service, remote terminal, file transfer, email, web.

1. Network layer: - Review. IP packet format. Addressing. NAT. Routing protocols (RIP, OSPF, BGP). ICMP. IGMP. DHCP. IPv6 - Mobile IP. Security at the network layer. IPsec and VPNs 2. Transport layer: - Review of transport layer. UDP. TCP. Classic variants of TCP (Tahoe, Reno). - New TCP implementations. - Congestion control. - Security at transport level. TLS / DTLS. 3. Application layer: - DNS. Review basic concepts. Advanced DNS. DNSSEC and DDNS. DoH and DoT. - Remote terminal protocols. Telnet, rlogin and ssh. - Files transfer protocols. FTP and TFTP. - Email service. RFC 822, MIME, SMTP, POP and IMAP. ESMTP, Security (STARTTLS, S-MIME), spam (spf, dkim). - Web service. HTTP / 1.X. HTTP / 2. IoT protocols: CoAP and MQTT. HTTP/3 and QUIC - Multimedia communications protocols. RTP, RTCP, RTSP, SIP. Content distribution networks (CDN). - Network management protocols.

FORMATION ACTIVITIES AF1 - Theoretical class [32 hours with 100% attendance, 1.06 ECTS] AF2 - Practical classes [12 hours with 100% attendance, 0.4 ECTS] AF4 - Computer room [10 hours with 100% attendance, 0.34 ECTS] AF7 - Individual student work [122 hours with 0% attendance, 4.06 ECTS] AF8 - Midterm and final exams [4 hours with 100% attendance, 0.14 ECTS] TEACHING METHODOLOGIES MD1 - Lectures in the teacher's class supported by computer and audiovisual media, in which the main concepts of the subject are developed and the bibliography is provided to complement the students' learning. MD3 - Resolution of practical cases, problems, etc ... raised by the teacher individually or in groups MD4 - Presentation and discussion in class, under the moderation of the teacher of topics related to the content of the subject, as well as practical cases MD5 - Preparation of works and reports individually or in groups