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 [...]
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 [...]
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 at p2p links [...]
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: [...]
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, ROUTER DEAD INTERVAL
7, ROUTER PRIORITY
8, DR [...]
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 to this feature, route mapping was supported only with dynamic Network Address Translation (NAT) [...]
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 server-side resources, [...]
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 difficult to distinguish.
In [...]
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 to [...]
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 question [...]
