Application gateways / firewall-information security, Computer Network Security

Application Gateways / firewall

The application level firewall is installed on a dedicated computer; also called as a proxy server. These servers can store the recently accessed pages in their cache and called as cache servers. As proxy server is placed in unsecured area of the network (for example DMZ), it is exposed to higher levels of risk from unreliable networks. Additional filtering routers can be implemented behind proxy server, further protecting internal systems. The disadvantage is they are characteristically restricted to a single application, as they work at application layer. Figure given below illustrates the different types of Firewalls which is compared to OSI model

 

 

255_Application Gateways -firewall.png

 

 

 Circuit Gateways

The circuit gateway firewall operates at transport layer. Filtering firewalls, do not normally look at data traffic flowing between two networks, but it prevent direct connections between one network and the other. This is can be accomplished by creating tunnels connecting specific processes or systems on each side of firewall, and allows authorized traffic in the tunnels.

 MAC Layer Firewalls

MAC layer firewalls which is designed to operate at media access control layer of OSI network model. This gives the ability to consider specific host computer’s identity in the filtering decisions of it. The MAC addresses of specific host computers are linked to access control list (ACL) entries that identify specific types of packets which can be sent to each host; all other traffic is blocked.

 Hybrid Firewalls


Hybrid Firewalls combine elements of other types of firewalls; that is, elements of packet filtering and proxy services, or of packet filtering and circuit gateways. On the other hand, it may consist of 2 separate firewall devices; each is a separate firewall system, but is connected to work in tandem. Without replacing the existing firewalls completely, an organization can make a security improvement, from this approach.

Posted Date: 10/9/2012 3:36:25 AM | Location : United States







Related Discussions:- Application gateways / firewall-information security, Assignment Help, Ask Question on Application gateways / firewall-information security, Get Answer, Expert's Help, Application gateways / firewall-information security Discussions

Write discussion on Application gateways / firewall-information security
Your posts are moderated
Related Questions
Problem a) Give the destination IP address, upper layer protocol, TTL in decimal and header checksum in hexadecimal; the source port number and the destination port number in deci


Techniques for combating Spam mails Many anti spam products are commercially available in market. But it should also be noted that no  one technique is a complete solution to

Cryptographic algorithms Cryptographic algorithms are broadly classified into two broad categories. They are stated below 1.  Symmetric Encryption and 2.  Asymmetric Encryptio

Illustrate about TinySec Protocol TinySec is implemented on the link layer and addresses security requirements of the resource staffed nodes in the WSN based on the link layer

SECURITY ANALYSIS Overview •    Know yourself: examine, identify, and understand the information and systems which are currently in place •    Know the enemy: examine, identify,

This project involves the design and development of a simulation environment of many sensors tagging material/ machinery/equipment/etc in a warehouse site to help monitor and manag

Question: (a) Besides privacy, what other security functions does Pretty Good Privacy (PGP) provides? (b) What is the Post Office Protocol (POP) used for? Why is it impo

What is information security Information security protects information (and facilities and systems which store, use and transmit it) from a broad range of threats, in order to p