My Netwok Dictionary

IVT and multilayer switching is very commonplace in today’s network. SVI can be used to allow inter-VLAN communication on a switch multilayer, eliminating the need for a separate router to get involved.

# Ping 30.1.1.1 HOST_1

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 30.1.1.1, timeout is 2 seconds:.....

The success rate is 0 percent (0 / 5)

# Ping 20.1.1.1 HOST_3

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 20.1.1.1, timeout is 2 seconds...

The success rate is 0 percent (0 / 5) Read the rest of this entry »

For frame relay encapsulation type, use the hardware configuration interface command encapsulation frame-relay [cisco | ietf]. The default encapsulation type is cisco. Cisco Use this option if you connect to another Cisco router or, conversely, use the ietf when connected to a router from another manufacturer.

Once set up frame-relay, we can use the following commands to obtain status information and solve problems.

• Show interface. Displays information on the package and the status of layers 1 and 2. It also displays information about DLCI and LMI.
• Show frame-relay lmi. Displays the LMI traffic statistics.
• Show frame-relay pvc. Displays the status of each configured connection and traffic statistics. This command is also used to determine the number of BECN and FECN packets received by the router. An example would be sh frame pvc 100.
• Show frame-relay map. View static mapping entries learned by the router.
• Clear frame-relay-InARP. Deletes allocations created by Inverse ARP.
• Debug frame-relay lmi. It allows to verify and troubleshoot a frame relay connection. Use this command to determine if the router and switch are sending and receiving LMI packets properly.

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To prepare for the CCNP certification as it helps one in circumstances that knowledge in writing prepare their own. As a suggestion for those summaries, here is with the topic “Frame Relay to”.

Frame Relay operates at the Layer 2 technology, and is an NBMA (Non Broadcast Multiple Access).

DTE and DCE

Router DTE, DCE is the FR-switch at the provider

Local Management Interface LMI

-runs between DTE and DCE
-Allocation of the DLCI DTE possible
-Keepalives
-LMI types: Cisco, ANSI, Q933a
-Auto Sensing from IOS 2.11 Read the rest of this entry »

1. Intrusion Attacks

This type of attack is when someone opens files one by one, on computer to find something that will be of interest. It may be an outsider or even someone who lives every day with us. It is noteworthy that many of the attacks recorded worldwide occur internally within the organization and / or company.

2. Espionage Attack Lines

It is when someone hears the conversation in which he is a guest. This type of attack is very common in wireless networks and is not required, as we know, a physical device connected to a wire that enters or leaves the building. Just being in a range where the sign of the network wireless comes on board a car or in a nearby building, so that someone is spying on our flow of information. Read the rest of this entry »

Router (config-router) # auto-summary
Restores the default behavior of automatic summarization of subnet routes into network-level routes.

Router (config-router) # default-information originate [route-map mapname]
Generates a default route. “Route” map mapname “is optional and will generate the default route if the route map is satisfied.

Router (config-router) # default-metric [number]
Sets the metric values for RIP perdeterminados, “number” = metric by default.

Router (config-router) # ip rip authentication key-chain [name-of-chain]
Package Enables authentication for RIP Version 2 (RIPv2 or RIP2). “Name-of-chain” specifies the set of keys or tools to use on an interface. Read the rest of this entry »