Spanning Tree Design

 

Basic IPv4 / IPv6 Routing

 

Optimizare topologie GNS3

Eficientizarea proceselor de cautare in tabela de rutare.

Configurare topologie simpla GNS3 partea a 3-a

CDP

Cisco Discovery Protocol

Configurare topologie simpla GNS3 partea a 2-a

Continuarea configurarilor din topologia anterioara

Configurare topologie simpla GNS3

Topologie CCNA 2

Apache2

In httpd.conf (/etc/httpd/conf/httpd.conf) este bine ca apache sa nu porneasca prea multe servere sau sa aibe prea multe servere care stau degeaba.

StartServers 1
MinSpareServers 1
MaxSpareServers 5
ServerLimit 50
MaxClients 50
MaxRequestsPerChild 5000

Network Security

Why is security important ?

Frame Relay

Definition

Frame relay este un protocol de comunicare de inalta viteza pentru retele WAN.

Beneficii:

• Latime de banda mai mare la un cost mai scazut
• Surplus de latime de banda pentru o perioada limitata (burst)
• Mai putin overhead
• Viteze intre 1,544 Mbps si 44,376 Mbps

HDLC, PPP

WLAN

 

Spanning Tree Protocol IEEE 802.1d

Ce este STP

• Protocol de L2.5 OSI
• Standardizat (Radia Perlmann)
• “Obsolete” (are neajunsuri)

Key Elements of 802.3/Ethernet Networks

VTP Pruning, Etherchannel, Port Blocking, Storm Control

1. VTP Pruning
2. Etherchannel (Introducere)
3. Lab Recapitulare (1 – 4)
4. Port Blocking
5. Storm Control

VTP

VLAN Trunking Protocol

VLAN

Virtual Local Area Network

Port security

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

Distance Vector Routing Protocols

 

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.

CCNA 3 Intro

Performante

 

In functie de cerinte CISCO are mai multe serii

Pentru Provider Core
7200, 7600, GSR-12000, CSR-1, CSR-3

Pentru Provider Edge
2800/2900, 3800/3900

Pentru nivelul Acces
800/1800/1900

Frame/Packet Format

IP Packet

Internet Protocol (IP) Packet Format

The Internet Protocol specified in RFC 791 defines the IP packet format. The IP packet header has specific fields that contain information about the packet and about the sending and receiving hosts. Below is a list of the fields in the IP header and a brief description for each one.

OSPF

Open Shortest Path First

• protocol de rutare link state
• direct competitor pentru EIGRP (proprietar CISCO)
• Protocol de rutare classless
• Scalabil prin folosirea de zone

Routing Table

Principles

1. Every router makes its decision alone, based on the information it has in its own routing table.

2. The fact that one router has certain information in its routing table does not mean that other routers have the same information.

3. Routing information about a path from one network to another does not provide routing information about the reverse, or return, path.

Routers

Cisco IOS will not allow two active interfaces on the same router to belong to the same network.

LAN Interfaces

• Ethernet interface also has a Layer 2 MAC address and participates in the Ethernet LAN in the same way as any other hosts on that LAN. For example, a router Ethernet interface participates in the ARP process for that LAN.
• When two routers are connected directly through the Ethernet interfaces, or when a PC NIC is connected directly to a router Ethernet interface, a crossover cable is used.