Archive for the ‘ITN’ Category

STP Port States and BPDU Timers

Posted: 13th December 2020 by ccna7guru in ITN

To facilitate the learning of the logical spanning tree and avoid loops, each switch port transitions through five possible port states and uses three BPDU timers.The five STP port states are as follows:■ Blocking: The port is a non-designated port and does not participate in frame forwarding. The port continues to process received BPDU frames […]

Spanning-Tree Algorithm

Posted: 13th December 2020 by ccna7guru in ITN

STP ensures that there is only one logical path between all destinations on the network by intentionally blocking redundant paths that could cause a loop. A switch port is considered blocked when network traffic is prevented from entering or leaving that port. STP uses the spanning-tree algorithm (STA) to determine which switch ports on a […]

NEW CCNA 200-301 PATTERN IN EXAMINATION Network Fundamentals: Includes basic fundamentals of networking 20% Network Access: How to connect to a network 20% IP Connectivity: Basics of Routing and Switching 25% IP Services: Includes services DNS, DHCP, FTP… 10% Security Fundamentals: Foundational knowledge 15% Automation and Programmability: Importance, basics and application 10%

Port Address Translation

Posted: 17th November 2020 by ccna7guru in ITN

Port Address Translation (PAT), also known as NAT overload, maps multiple private IPv4 addresses to a single public IPv4 address or a few addresses. This is what most home routers do. The ISP assigns one address to the router, yet several members of the household can simultaneously access the internet. This is the most common […]

Dynamic NAT

Posted: 17th November 2020 by ccna7guru in ITN

Dynamic NAT uses a pool of public addresses and assigns them on a first-come, first-served basis. When an inside device requests access to an outside network, dynamic NAT assigns an available public IPv4 address from the pool. In the figure, PC3 has accessed the internet using the first available address in the dynamic NAT pool. […]

Selección de las unidades ópticas

Posted: 10th November 2020 by ccna7guru in ITN

Los factores que deben tenerse en cuenta al adquirir una unidad óptica se enumeran en la Figura 1. En la tabla de la Figura 2 se resumen las funcionalidades de las unidades ópticas. Los DVD pueden almacenar una cantidad de datos mayor que el CD y los discos Blu-Ray (BD) pueden almacenar una cantidad de […]

Cómo acceder al material del curso CISCO Netacad

Posted: 2nd November 2020 by ccna7guru in ITN

después de la compra, obtenga una cuenta netacad, viva con un instructor. chat en vivo sobre el curso. acceso completo al curso con una cuenta oficial de Cisco Netacad como estudiante. Podrás acceder al curso de por vida. Se encuentran disponibles asignaciones, laboratorios, comentarios del curso y exámenes finales. Curso CCNA1: Introducción a las Redes […]

Interface Verification Commands

Posted: 31st October 2020 by ccna7guru in ITN

There is no point in configuring your router unless you verify the configuration and connectivity. This topic covers the commands to use to verify directly connected networks. It includes two Syntax Checkers and a Packet Tracer. There are several show commands that can be used to verify the operation and configuration of an interface. The topology in […]

Limitar y Aprender MAC Addresses

Posted: 30th October 2020 by ccna7guru in ITN

Para poner el numero máximo de direcciones MAC permitidas en un puerto, utilice el siguiente comando Switch(config-if)# switchport port-security maximum value El valor predeterminado de port security es 1. EL numero maximo de direcciones MAC seguras que se puede configurar depende del switch y el IOS. En este ejemplo, el maximo es 8192. El switch […]

El método más simple y eficaz para evitar ataques por saturación de la tabla de direcciones MAC es habilitar la sport security. La seguridad de puertos limita la cantidad de direcciones MAC válidas permitidas en el puerto. Permite a un administrador configurar manualmente las direcciones MAC para un puerto o permitir que el switch aprenda […]