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Spanning Tree Protocol IEEE 802.1d

Mar 28, 2011 · 3 min read · ccna 3 stp

Ce este STP Protocol de L2.5 OSI Standardizat (Radia Perlmann) “Obsolete” (are neajunsuri) Rolul STP a) Descoperirea legaturilor logice redundante dintr-o inter-retea de L2 urmata de blocarea redundantei b) Descoperirea modificarilor de topologie din aceasi inter-retea Grafic 1 Terminologie: 1. Root Bridge Se deriva d…

Key Elements of 802.3/Ethernet Networks

Mar 23, 2011 · 13 min read · ccna 3 ethernet switchport info

CSMA/CD -Carrier Sense If a device detects a signal from another device, it waits for a specified amount of time before attempting to transmit. "listening before transmit" mode -Multi-access Using a shared medium to communicate -Collision Detection When a device is in listening mode, it can detect when a collision occ…

VTP Pruning, Etherchannel, Port Blocking, Storm Control

Mar 20, 2011 · 5 min read · port-blocking etherchannel vtp port security storm control info

VTP Pruning Etherchannel (Introducere) Lab Recapitulare (1 – 4) Port Blocking Storm Control C ii zice lui B: Sunt interesat in VLAN-urile 20 si 30 B tunde corespunzator VLAN-ul 10 catre C si atat B ii zice lui A: Am interes in VALN-ul 10 si 20 dar am pe alta interfata si VLAN-ul 30 deci am interes in VLAN-ul 10…

VTP

Mar 14, 2011 · 5 min read · ccna 3 vtp port security VLAN cisco info

VLAN Trunking Protocol 1) Lab anterior Cerinte: Configurare manuala interfete de tip trunk Configurare manuala interfete de tip access Port-Security Maximum 3 1 static 2 dynamic Violation Protect Toate VLAN-urile la fiecare switch VLAN-uri: VLAN Spatiu de adrese Adrese 10 10.0.0.0/24 C1 –.1 C7 –.7 …

VLAN

Mar 6, 2011 · 8 min read · troubleshoot ccna 3 VLAN switchport

Virtual Local Area Network VLAN=domeniu de broadcast=spatiu de adrese IP Nu trebuiesc porturi consecutive pe switch. By default toate porturile fac parte dintr-un singur domeniu de broadcast Este o separare logica a switch-ului - 2950 (maxim 64 de VLAN-uri) - 2960 (maxim 255 VLAN-uri) VLAN-ul default pentru interfete …

Port security

Feb 27, 2011 · 4 min read · ccna 3 port security configure switchport cisco commands

Securitatea la switch de nivelul de tip acces a) Port security b) port protected c) Port blocked d) Acces la switch fara parola e) Storm control a) Default nu e pornit Port Security Tipuri de atacuri oprite de Port Security - MAC address spoofing - schimbarea MAC-ului asignat de vendor cu un altul - Se aplica doar pen…

Distance Vector Routing Protocols

Feb 21, 2011 · 5 min read

The meaning of Distance Vector:A router using distance vector routing protocols knows 2 things:Distance to final destination.Vector, or direction, traffic should be directed. RIP uses hop count as the metric for path selection.If hop count for a network is greater then 15, RIP cannot supply a route to that netw…

CCNA 3 Intro

Feb 20, 2011 · 5 min read · ccna 3

Punctele au fost:1)structura switchuluia)hardwareb)software2)moduri de operare, promptere3)configurarea de baza a switchului4)laboratorLa partea de comenzi au fost asa:show versionshow mac address-table [dynamic][static]show ip redirectsshow interface statusshow arpconfigurarea vlan-ului(c)#interface vlan 1(c)#ip addr…