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

The objective of this course is to study advanced aspects of the protocols that support the Internet, particularly advanced features of the transport layer, security, and the main application-layer protocols of the Internet: DNS, email, file transfer, remote terminal, web, and others. Upon completing the course, the student should: - Understand the advanced functions of transport protocols (for example, TCP flow and congestion control mechanisms). - Be familiar with the basic principles of cryptography and encryption, symmetric and public-key algorithms, digital signatures, message digests, public key infrastructure, and security in communications at the transport (TLS) and application layers. - Be familiar with the basic messages and formats, operation, and architecture of the various application-layer protocols covered in the course: name service, remote terminal, file transfer, email, and 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