Thumb.db is is a cache of the current picture in that directory.to remove it go for following
step1 > open "WINDOWS EXPLORER".
2>go to "TOOLS".
3>open "FOLDER OPTIONS".
4>go to "VIEW".
5>see 1st section "FILES & FOLDERS".
6>click on the "DO NOT CACHE THUMBNAILS".
now the thumbnail file will be removed from ur computer once u do this the file will be never created.
EIGRP short of Enhanced Interior Gateway Routing Protocol is a routing protocol used to select the best suitable route for packets with in a network. Basically EIGRP is the enhanced version of IGRP protocols and developed by Cisco Systems. EIGRP uses a bandwidth and delay method to calculate the metric of a network route.
Today tip help you to enable authentication of enhanced interior gateway routing protocol packets to protect routing table. In this case, we will try to configure two different routers with routing protocol EIGRP and then perform the authentication between them using the IP authentication key-chain eigrp interface command.
Follow the network topology of two different class network in given figure:
Configuration to Enable EIGRP on Router A
In global configuration Mode:
A (config# router eigrp 20
(Enable EIGRP protocol and 20 is Autonomous number).
A (config-router)# network 40.0.0.0
(Advertised router A Serial Network 40.0.0.0).
A (config-router)# network 210.100.10.0
(Advertised router A Ethernet Network 210.100.10.0).
Configuration to Enable EIGRP on Router B
In global configuration Mode:
B (config) # router eigrp 20
(Enable EIGRP protocol and 20 is Autonomous number)
B (config-router) # network 40.0.0.0
(Advertised router B Serial Network 40.0.0.0).
B (config-router) # network 210.100.30.0
(Advertised router B Ethernet Network 210.100.30.0 ).
Now Configure EIGRP Authentication on Router A
In global configuration Mode:
First create the key chain with the name professional used in this example.
A (config) # key chain professional
Now set the key number 1 used in this example.
A (config-keychain) # key 1
Now set the key string for the key name imperial used in this example.
A (config-keychain-key) # key-string imperial
A (config-keychain-key) # end
Now specify the interface that you want to configure EIGRP message authentication.
A (config) # interface serial 0
A (config-if) # ip authentication key-chain eigrp 1 professional
A (config-if) # ip authentication mode eigrp 1 md 5
A (config-if) # end
Now Configure EIGRP Authentication on Router B
In global configuration Mode:
First create the key chain with the name professional used in this example.
B (config) # key chain professional
Now set the key number 1 used in this example.
B (config-keychain) # key 1
Now set the key string for the key name imperial used in this example.
B (config-keychain-key) # key-string imperial
B (config-keychain-key) # end
Now specify the interface that you want to configure EIGRP message authentication.
B (config) # interface serial 0
B (config-if) # ip authentication key-chain eigrp 1 professional
B (config-if) # ip authentication mode eigrp 1 md 5
B (config-if) # end
