ISC2 Exam ISSAP Topic 2 Question 8 Discussion

effort.

Firewall is used to protect an internal network or intranet against unauthorized access from the Internet or other networks. It restricts

inbound and outbound access and can analyze all traffic between an internal network and the Internet. Users can configure a firewall to pass

or block packets from specific IP addresses and ports.

Answer option B is incorrect. A firewall is also in-built within a proxy server. Although implementing a proxy server on the network will

implement the firewall automatically, it will be a software-based solution.

Answer option A is incorrect. A brouter is a combination of a bridge and a router. It is used to connect dissimilar network segments, and it

routes only a specific transport protocol such as TCP/IP. A brouter also works as a bridge for all types of packets, passing them on as long as

they are not local to the LAN segment from which they have originated.

Answer option C is incorrect. Router is a device that routes data packets between computers in different networks. It is used to connect

multiple networks, and it determines the path to be taken by each data packet to its destination computer. Router maintains a routing table of

the available routes and their conditions. By using this information, along with distance and cost algorithms, the router determines the best

path to be taken by the data packets to the destination computer. A router can connect dissimilar networks, such as Ethernet, FDDI, and

Token Ring, and route data packets among them. Routers operate at the network layer (layer 3) of the Open Systems Interconnection (OSI)

model.