My Netwok Dictionary

Probably more familiar to identify a device, a host or a server with a name that associated with its tasks or other performance criteria. This is done by creating a table host, associating a name with one or more IP addresses.

The following table has created a host with the command

ip host [name] IP address
MADRID (config) # ip host 204.200.1.2 SERVER
MADRID (config) # ip host 220.220.10.32 ROUTER
MADRID (config) # ip host 210.210.2.22 HOST
MADRID (config) # exit Read the rest of this entry »

Cisco develops several versions of their operating system IOS (Internetwork Operating System) and launches new versions continuously. The IOS provides various functions and also runs on various hardware platforms.

Cisco has established a convention to identify by name the different versions of IOS files.
The IOS naming convention uses several fields. Read the rest of this entry »

When it is necessary to restore or upgrade the IOS router must be done from a TFTP server. It is important to keep backups of all the IOS on a central server.

The command for this task is the copy flash tftp through the show flash command verify the file name to save:

Router # show flash

System flash directory:
File Length Name / status
1 3709210 C4500-js-l_121-5.bin
[3709276 bytes Used, 4679332 available, 8388608 total]
8192K bytes of processor board System flash (Read / Write)
Read the rest of this entry »

The configuration of static routes is via the global configuration command ip route IOS. The command uses several parameters, among which include the network address and associated netmask, and information about the place you should send packets destined for that network.

The destination information can take one of the following ways:

A specific IP address of the router next route. The network address of another route to the routing table to be forwarded to the interface connected directly packages which is the destination network. Read the rest of this entry »

Designing networks using only static routes would be tedious to administer and would not respond well to interruptions and changes in topology that usually occur with some frequency. To respond to these problems dynamic routing protocols were developed. The dynamic routing protocols are algorithms that allow routers to publish or announce the existence of the network routing information necessary to create the IP routing table. These algorithms also determine the criteria for selecting the path of the package when it is presented to the router waiting for a decision to commute. The objectives of the routing protocol are to provide the user the ability to select the appropriate path in the network to react quickly to changing it and perform such tasks more easily and with less overhead on the router as possible. Read the rest of this entry »

1. Change the SSID (Service Set IDentifier). The SSID is basically the public name of your network. All components of a wireless network (WiFi) must have the same SSID to communicate.
   Any hacker knows the default names for different brands of wireless router. Therefore you should change this name to a name that is easy to remember for you.
   However, you should not use names that are easy to identify as your name or surname, the name of your company, address, phone number, your license or social security. It is best to use a combination of numbers, letters and other characters.
2. Disable SSID broadcast (SSID broadcast). In doing so, most scanners will not see your network.

Read the rest of this entry »

There are different types of networks (private) according to their size (in terms of number of machines), their speed transfer of data and their extent. Private networks are networks within a single organization. It is generally three categories of networks:

LAN (local area network)
MAN (metropolitan area network)
WAN (wide area network)

There are two other types of networks: TAN (Tiny Area Network) identical to the LAN but less extensive (2-3 machines) and CAN (Campus Area Network) MAN identical (with a maximum bandwidth between all LAN Network ). Read the rest of this entry »

To check the routing tables, running the command show ip route:

Router # show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, * - candidate default
U - per-user static route, o - ODR
Read the rest of this entry »