CCNA R&S 2019 (200-125) By Hexa CCIE Khawar Butt

Explore class c subnetting with examples: split a class c network provided by your ISP into five, fifteen, and twenty-five subnets using a magic table, increments, and Cisco router configurations.

learn how to manage router configuration files by saving the running config from ram to startup-config, and verify with show running-config and show startup-config.

Explore the two serial encapsulations: hdlc and bpp, and their ability to carry multiple protocols. Assess how bpp adds authentication, link control, multi-link bundling, and error detection compared to hdlc.

Configure a point-to-point PPP connection on serial interfaces by changing encapsulation, verify connectivity with show commands, and understand PPP advantages like industry standard, authentication, and multi-link load balancing.

Enable remote management by configuring IP connectivity to access the router's console remotely. Telnet is simple but plaintext; SSH provides encrypted access with username and password and enable password.

Configure telnet remote management with username and password authentication by creating a local accounts database for administrators, enabling per-user logins on virtual terminal lines and testing from multiple devices.

Explore RIP version 2, a distance-vector dynamic routing protocol, including hop-count metrics, update timers, split horizon, authentication, and route summarization to optimize small networks.

Discover how passive interfaces in RIP v2 prevent unnecessary multicast updates on non-router links while keeping networks advertised from enabled interfaces.

Configure basic eigrp on a multi-router topology, enable edge ip on interfaces, set the same autonomous system, and use network statements with inverse masks to advertise subnets and verify neighbors.

Apply ip passive-interface under eigrp to stop both sending and receiving updates on interfaces of land segments, contrast with rip, and implement on specified interfaces in the lab.

Configure OSPF in a single area on a point-to-point link by setting a locally significant process ID and router-id, then advertise loopback interfaces in area zero.

Learn how OSPF metrics are calculated using the default reference bandwidth and interface speeds, and how to adjust the auto cost reference bandwidth to differentiate fast ethernet from gigabit links.

Learn IPv6 addressing: 128-bit space, hex notation, default 64-bit network and host, eight blocks of four hex digits, and colon-based zero compression.

Track how IPv6 addresses flow from IANA to regional registries and ISPs, and how corporate /48 and end-user /56 allocations enable thousands of subnets with a 64-bit host portion.

Master IPv6 address assignment with SLAAC. Derive host addresses from MAC using EUI-64 with fffe insertion and the inverted seventh bit for locally administered addresses.

Learn how to enable ripng on ipv6 routers using per-interface configuration, compare ripng with rip version 2, and verify updates with show commands via a dedicated process ABC.

Learn how the standard numbered ACL filters traffic by source IP, uses wildcard masks, and is applied closest to the destination on routers to block specific networks or hosts.

Set up a simple two-switch topology to verify BPDU guard with portfast, configure trunk ports and VLANs 10 and 20, enable portfast and BPDU guard, and verify immediate forwarding.

Configure static etherchannel port channels between switches, assigning gigabit interfaces to a channel group, creating port-channel interfaces, and configuring trunks, VLAN 10, and IP routing.

Explore etherchannel using LACP negotiation, compare active and passive modes, configure port channels and trunks, and test layer 2 and layer 3 connectivity via SBI across switches.