- Networks
Learning the basics of the OSI model
The 7 layers of the OSI model explained one by one: data unit, protocols, devices, common mistakes, the journey of an HTTP request, and a TCP/IP comparison.
202616 min - Networks
Wide Area Networks (WAN)
A guide to the wide area network (WAN): the LAN and the MAN, the local loop, xDSL, fiber, MPLS, SD-WAN, PPP, IPsec VPN and how to compare two operator offers.
202620 min - Networks
How to configure VLANs on Cisco/IOS network equipment
Configure VLANs on Cisco Catalyst switches: read the default VLAN configuration, create VLAN 10 and assign the switch interfaces to it in access mode.
20222 min - Networks
Understanding the trunk, the basis of VLAN encapsulation
How a trunk carries several VLANs over one link: 802.1Q and ISL encapsulation, the VLAN tag inside the Ethernet frame, and the commands to configure it.
20222 min - Networks
Cisco IOS guide - Commands and configuration
Configuring a Cisco IOS device: CLI modes, network interfaces, DHCP service, access passwords, hostname, saving the configuration and remote SSH access.
20217 min - Networks
Test your networking knowledge
A three-part networking exercise covering communications and protocols, IP addressing and a network diagram, followed by the complete set of answers.
20215 min - Networks
SNMP Configuration on Cisco Packet Tracer
How to configure a router or a switch as an SNMP agent in Cisco Packet Tracer, then read and set values from the MIB browser of a PC on the network.
20215 min - Networks
SNMP: network management and monitoring
What SNMP is and how it works: the manager (NMS), the agents, MIB files, UDP ports 161 and 162, traps, and the role of the SNMP community string.
20216 min - Networks
The protocols
A reference sheet of the main network protocols with their ports: DNS, DHCP, FTP, Telnet, SSH, SFTP, SMTP, IMAP, POP3, HTTP, TLS/SSL, ICMP, IP, TCP and UDP.
20215 min - Networks
Example DAT
Securing network equipment: enable secret, technician accounts, passwords on the console and virtual lines, and SSH access on Cisco equipment.
20213 min - Networks
WAN design
When designing a wide area network (WAN), choosing the right connection type is one of the hardest problems. An overview of circuit, packet, cell and dedicated links.
20218 min - Networks
HSRP – HOT STANDBY ROUTING PROTOCOL
HSRP on Cisco routers: virtual IP address, priority, preemption and interface tracking, with a step-by-step configuration and a failover test between two routers.
20217 min