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Screening Router
In this setup network router acts as a firewall. It checks all incoming and outgoing packets according to the predefined rules. This filter is placed at the connecting point to the external network. Clients on local network and on the Internet are allowed to communicate directly but their communication is restricted to the type allowed by the router. As router is needed for connecting to the Internet so this firewall is almost free .
Advantages
• Cheapest, simple and transparent • Router could be replaced with some intelligent system to provide better access control
Disadvantages
• Requires complex filtering rules and hence error-prone• Fine grained access control is near impossible• Cannot add authentication system• If router is compromised somehow then security is at risk
DLCI stands for Data Link Connection Identifier. It identifies the local PVC.
The address for a device as it is recognized at the Media Access Control (MAC) layer in the network architecture. MAC address is usually stored in ROM on the network adapter card a
Recognize the command to view the configuration-register value Ans) show version is the command to view the configuration-register value
What is Remote Procedure Call (RPC)? RPC hides the intricacies of the network by using the ordinary process call mechanism familiar to every programmer. A client process calls
Q. What are the trends in Network Security ? Trends in Network Security Improved vigilance for virus infections Continual maturation of firewall technologies
Explain BGP path attributes
What are the key functions of data link layer? Data link layer transfers data in a structured and reliable manner so that the service given by the physical layer is utilized by
What are the Disadvantages of Microwaves? a. Attenuation by solid objects: birds, snow, rain, and fog. b. Reflected from flat surfaces such as water and metal. c. Diffra
what is dce
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