filed in CCNA Security, Network Security on Mar.18, 2009
Denial-of-Service Attack:
In DOS Attack after gaining access to your network, the attacker can do any of the following:
Randomize the attention of your internal Information Systems staff so that they do not see the intrusion immediately, which allows the attacker to make more attacks during the diversion.
Send invalid data to applications or network services, which causes [...]
filed in CCNA, CCNA Security on Mar.09, 2009
IPv4 (Internet Protocol version 4)
The current generation of IP, in which an IP address has two parts: The first is the network ID and the second is the host ID. Under IPv4, there are five classes (Class A through Class E), which differ in how many networks and hosts are supported.
IPv6 (Internet Protocol version 6)
An [...]
filed in CCNA, CCNA Security on Mar.07, 2009
The Cisco access control list (ACL) is used not only used for packet filtering (a type of firewall) but also for selecting types of traffic to be analyzed, forwarded, or influenced in some way.
Cisco ACLs are divided into types.
Standard IP ACL,
Extended IP ACL.
Standard IP Access Lists:
A Standard Access List only allows you to permit or [...]
filed in CCNA, CCNA Security on Mar.01, 2009
VLAN hopping (virtual local area network hopping) is a computer security exploit, a method of attacking networked resources on a VLAN. The basic concept behind all VLAN hopping attacks is for an attacking host on a VLAN to gain access to traffic on other VLANs that would normally not be accessible.
Trunk ports have access to [...]
filed in CCNA, CCNA Security, Free Softwares, VISTA Tips & Tricks on Feb.25, 2009
There is a fundamental difference between Switch & hubs functionality. When a hub receives a packet on one port, it will send out a copy of that packet on all ports except on the one where it was received. On the other hand Switch build up a Layer 2 forwarding table based upon the source [...]