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How Does a Firewall Protect
Firewalls work by controlling the information that comes in and out of the network. By using the Application Proxy service, the flow of information to the network can be controlled. A proxy is an application program that permits or forbids access by accepting or rejecting requests sent to it. Only valid users can log in and pass through a proxy service. It works on the Application level of the OSI model . Another technique that can be used is Encryption. A firewall may also combine encryption to provide confidentiality and authenticity. However this feature never works alone but is always combined with one of the above methods.
Bridge A bridge operation sin both physical and data link layer of OSI model. At physical layer it works like repeater as it regenerates the signal and performs int
DNS Records and Messages Two types of records are used DNS. The question records are used in the question section of the query and response messages. The resource reco
In case of any new event switch do broadcast, after that always do Unicast.
"SAP" is used by the Cisco IOS for which encapsulation types? Ans) Three types:- Ethernet_802.2 Token-Ring FDDI_802.2
Q. Illustrate the Advantages of VLANs? - Cost and time reduction in moving stations from one group to another - Creation of virtual workgroups - Security Position of
In connectionless schema, there is no connection required. The source of data includes destination information in data and transmit to the network. Network transmit each data item
Q. Explain Silly window syndrome? When either sending application sends data gradually or receiving application consumes data slowly - Illustration when 1 byte sent 40 bytes
Q. What is Data traffic? Data traffic Peak data rate : max data rate of the traffic Average data rate = (amount of data)/time Maximum Burst size: max. l
configure a router . get the default gateway
Fast Ethernet Operates at 100 Mbps faster speeds required for image processing, CAD, real-time audio and video No change in frame addressing, format or access method
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