Networking

What DHCP is and how to configure DHCP on a Cisco router: enable the DHCP server, create an address pool, set the gateway and DNS, and verify leases.

Border Gateway Protocol (BGP) explained: how internet routing between autonomous systems works, BGP path selection and common use cases.

AAA in networking explained: authentication, authorization and accounting, RADIUS vs TACACS+, and a working Cisco AAA configuration with local fallback.

VLAN Trunking Protocol (VTP) explained: server, client, transparent and off modes, versions 1 to 3, the revision risk and Cisco commands.

Inter-VLAN routing configuration on Cisco: legacy routing, router-on-a-stick with 802.1Q subinterfaces, and SVIs on a Layer 3 switch, with checks.

What a VLAN is, why networks use VLANs, and step-by-step VLAN configuration on Cisco switches: creating VLANs, access ports, 802.1Q trunks and verification.

What a network switch is, how it forwards frames, the main switch types, and a basic, secure network switch configuration on a Cisco switch.

Practical ACL questions and answers: write Cisco access lists for real scenarios, like permitting email only between two networks, with explained solutions.

Extended ACL examples: permit or deny traffic by source and destination address, protocol and port, with Cisco configuration commands.

Standard ACL examples: permit or deny specific hosts, networks and subnets using wildcard masks, with Cisco configuration commands.