COMPUTER THREATS SECURITY
WHAT IS A FIREWALL IN NETWORK SECURITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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A workstation is using the DNS protocol to send a name resolution request to a DNS server.
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Someone is downloading files from a server using the FTP protocol.
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Someone is using voice over IP (VoIP) to make a telephone call.
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A man-in-the-middle attack is in progress.
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Detailed explanation-1: -The MGCPprotocol is generating traffic, which VoIP uses to send voice data over a network. You are monitoring network traffic on your network, and you see traffic between twonetwork hosts on port 1720. What is the source of this network traffic? Someone is using voice over IP (VoIP) to make a telephone call.
Detailed explanation-2: -A Firewall is a network security device that monitors and filters incoming and outgoing network traffic based on an organization’s previously established security policies. At its most basic, a firewall is essentially the barrier that sits between a private internal network and the public Internet.
Detailed explanation-3: -Proxy firewalls, also known as application-level firewalls, filter network traffic at the application layer of the OSI network model. As an intermediary between two systems, proxy firewalls monitor traffic at the application layer (protocols at this layer include HTTP and FTP).
Detailed explanation-4: -The first firewalls were packet-filtering firewalls that work at the Network layer of the OSI networking model. They examine the packet headers that contain IP addresses and packet options and block or allow traffic through the firewall based on that information.
Detailed explanation-5: -A firewall is a network security device that monitors and filters incoming and outgoing network traffic in accordance with previously established security policies in an organization.