I am also a step-by-step through the OCP exam came, and in the process of OCP study encountered a lot of questions, to do their own experiments through the side of a post through the question (in this I would like to thank those who helped my people), I learned a lot , there is [...]
Archive for March, 2009
March 27th, 2009 - 3:31 am ≡ by admin ≡ in IT Technology
Port redirect
I believe we all foresee such a problem, right? Is that when you in their own local area network (lan) Units 1 to set up an internal Web Server, when someone from the Internet (Wan) can not be a normal visit to Lan’s Web Server you are not very painful? Or you local area network [...]
March 27th, 2009 - 3:25 am ≡ by admin ≡ in IT Technology
OSPF Notes
1. Ospf are set up should not use the secondary ip neighbor relations 2. Only secondary ip and primary ip in the same area within the time, go out in order to be declared 3. An area can have a number of DR, but a broadcaster DR region there can be only one 4. Ospf [...]
March 27th, 2009 - 3:20 am ≡ by admin ≡ in IT Technology
Multilink-PPP with CHAP authentication
Topography: Configure R1 1: username R2 password 0 cisco 2: ! 3: interface Multilink1 4: ip address 172.16.12.1 255.255.255.0 5: ppp authentication chap 6: ppp multilink 7: ppp multilink group 1 8: ! 9: interface Serial1/0 10: no ip address 11: encapsulation ppp 12: serial restart-delay 0 13: ppp multilink group 1 14: ! 15: [...]
March 27th, 2009 - 3:15 am ≡ by admin ≡ in IT Technology
OSPF HELLO Packets Information
OSPF’s HELLO packet, in its neighbor set up process plays an important role, we need to know about its structure and content package. 1, ROUTER-ID of the originating router (in addition to this, the other for the interface parameters) 2, Area ID 3, ADDRESS MASK 4, Authentication Type and Authentication information 5, HELLO INTERVAL 6, [...]
March 27th, 2009 - 3:12 am ≡ by admin ≡ in IT Technology
NAT – Ability to Use Route Maps with Static Translations
Feature History Release Modification 12.2(4)T This feature was introduced. 12.2(4)T2 Support for the Cisco 7500 series routers was added. This document describes the NAT—Ability to Use Route Maps with Static Translations feature. It includes the following sections: Feature Overview Supported Platforms Supported Standards, MIBs, and RFCs Configuration Tasks Configuration Examples Command Reference Feature Overview Previous [...]
March 26th, 2009 - 4:13 am ≡ by admin ≡ in IT Technology
Protect server from DDOS attack(Tcp Intercept)
In order to prevent hackers using tcp syn category DDOS attack servers, Cisco at 12.4IOS added characteristics of TCP Intercept HACKER — R2 — server (1.1.1.1) If the hackers have to the server after R2 launched DDOS type tcp syn flood attacks, launched a large number of half-open TCP session, trying to run out of [...]
March 26th, 2009 - 4:11 am ≡ by admin ≡ in IT Technology
Priority VS Bandwidth
Priority and Bandwidth at our QOS are often used in the two orders, but they are exactly what the difference between Priority at cisco official documentation has been so often described: reserved bandwidth Bandwidth: Minimum bandwidth guarantee One is set aside, one is a guaranteed minimum bandwidth, the vague very vague, almost CISCO themselves are [...]
March 26th, 2009 - 4:08 am ≡ by admin ≡ in IT Technology
Cisco 3550 Switch MAC Address Access Control list
Network management at work, usually encounter such a situation: some users in violation of management rules, modify their own private IP address, in order to achieve access restricted resources. Such behavior not only undermines the information security rules, but also probably because the address network communications failures caused by the conflict. Network administrators might try [...]
March 26th, 2009 - 3:58 am ≡ by admin ≡ in IT Technology
How to configure QoS on 3750/6509/7206?
Q: At around on my network has more than 100 phone software stack through a 3750 switch connected to a VLAN on, and then connect to a 6509 switch on (release layer), and then through a 7206 router (core layer) connected to the WAN on. Aspect VoIP gateway using a receive calls through SIP. My [...]