My Netwok Dictionary

In their operations, network control and monitoring systems can use a lot of bandwidth. More controlled devices and is the latest monitoring, but also require much more bandwidth than your system of control than usual traffic on the network.

Configuring a network monitoring tool: basic principles

The tool table is the basic command of a control system network. Usually you type ping host1 to obtain a series of results. But what are the transactions with this command? Read the rest of this entry »

In order for VLANs to communicate between them should be needed the services of a router. To this must be set subinterface FastEthernet, encapsulation and corresponding IP address so that each of these belong to a specific vlan. Read the rest of this entry »

The process for establishing an ISDN connection is initiated when the channel D, which is always active, it sends the number you call the ISDN switch. Traffic on the D channel protocol uses the Link Access Procedure on D channel (LAPD). The LAPD is a link layer protocol of HDLC-based data. The local switch uses the protocols SS7 (Signaling System 7) to set the path to the terminating switch which ended the destination on the D channel.

The channel B mode is then connected end-to-end to send voice or data per channel, or both at once.

The devices must negotiate which protocol to use common data link (PPP, X.25 or Frame-Relay). Read the rest of this entry »

Let’s see the configuration of TFTP server, which can be useful to download an image on a device not directly accessible.

Router # conf t
Router (config) # tftp-server?
Flash: Allow URL file TFTP load requests
null: Allow URL file TFTP load requests
nvram: Allow URL file TFTP load requests
system: Allow URL file TFTP load requests
Router (config) # tftp-server flash:?
flash: c1700-Y7-mz.123-13.bin Read the rest of this entry »

CEF = Cisco Express Forwarding
ACE = Access Control Entities
TCAM includes:
FM = Feature Manager
SDM = Switching Database Manager
VMR = Value Mask Result
LOU = Logical Unit Operational
PMD = Physical Medium Dependent
ASIC = Application-specific integrated circuits
VMPS = VLAN Policy Server Membersip
Tags TPID = Protocol Identifier Read the rest of this entry »

ACL (Access Control List) can be used for:

• Packet security / filtering
• Defining “interesting” traffic for dial on demand routing (DDR) - only trigger dial-up line in case of “interesting” traffic
• QoS - not in But in CCVP CCNA, CCIP and CCNP
• NAT
• Control routing advertisement, through filtering routing updates

Creation - types of ACLs

• Standard IP ACLs
• Only source IP address
• Predefined ranges: 1-99, 1300-1999

rt # configure terminal
rt (config) # access list ACL # permit | deny hosts
rt (config) # access list 10 deny 172.16.0.15
rt (config) # access list 10 permit any
rt (config) # access list 20 deny 10.0.0.55 0.0.0.0
rt (config) # access list 10 permit 10.0.0.0 0.255.255.255 Read the rest of this entry »

In order to deliver message to potential damage or intrusion, there are several types of banners.

MADRID (config) # banner?
LINE c banner-text c, where 'c' is a delimiting character
exec Set EXEC process creation banner
incoming Set incoming terminal line banner
login Set login banner
motd Set Message of the Day banner 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 »

Router (config) # router IGRP 100
Router (config-router) # network 192.168.1.0
Router (config-router) # network 200.200.1.0
Router (config-router) # variance?
<1-128> Metric variance multiplier
Router (config-router) # variance 2
Router (config-router) # traffic-share?
Share inversely proportional to balanced metric
Among min All traffic shared min metric paths Read the rest of this entry »

The boot system command specify the name and location of the IOS image to load.

Router (config) # boot system flash [filename]
Tells the router to boot using the IOS which is located in flash memory.

Router (config) # boot system rom
Tells the router to look for IOS in ROM

Router (config) # boot system tftp [filename] [dirección_servidor]
Tells the router to boot the image has to load IOS from a TFTP server.