What is packet filter?

Networking Interview Questions and Answers

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80. What is packet filter?

Packet filter is a standard router equipped with some extra functionality. The extra functionality allows every incoming or outgoing packet to be inspected. Packets meeting some criterion are forwarded normally. Those that fail the test are dropped.

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Other Interview Questions

• What is an Object server?
• What is a Transaction server?
• What is a Database Server?
• What are the most typical functional units of the Client/Server applications?
• What are all the Extended services provided by the OS?
• What are Triggers and Rules?
• What is meant by Transparency?
• What are TP-Lite and TP-Heavy Monitors?
• What are the two types of OLTP?
• What is a Web server?
• What are Super servers?
• What is a TP Monitor?
• TP Monitor does mainly two things extremely well. They are Process management and Transaction management.?
• What is meant by Asymmetrical protocols?
• What are the types of Transparencies?
• What is the difference between trigger and rule?
• What are called Transactions?
• What are the building blocks of Client/Server?
• Explain the building blocks of Client/Server?
• The middleware buliding block runs on both the client and server sides of an application. It is broken into three categories:-
• What are all the Base services provided by the OS?
• What are the roles of SQL?
• What is Structured Query Langauge (SQL)?
• What are the characteristics of Client/Server?
• What is Remote Procedure Call (RPC)?
• What are the main components of Transaction-based Systems?
• What are the three types of SQL database server architecture?
• What are the Classification of clients?
• What are called Non-GUI clients, GUI Clients and OOUI Clients?
• What is Message Oriented Middleware (MOM)?
• What is meant by Middleware?
• What are the functions of the typical server program?
• What is meant by Symmentric Multiprocessing (SMP)?
• What are Service-specific middleware?
• What are General Middleware?
• What is meant by Asymmetric Multiprocessing (AMP)?
• What is OLTP?
• What is meant by 3-Tier architecture?
• What is meant by 2-Tier architecture?
• What is Load balancing?
• What are called Fat clients and Fat servers?
• What is meant by Horizontal scaling and Vertical scaling?
• What is Groupware server?
• What are the two broad classes of middleware?
• What are the types of Servers?
• What is a File server?
• What are the five major technologies that can be used to create Client/Server applications?
• What is Client/Server?
• List out the benefits obtained by using the Client/Server oriented TP Monitors?
• What are the services provided by the Operating System?
• What is ACID property?
• What are Stored procedures?
• What is wide-mouth frog?
• What is passive topology?
• What is region?
• What is virtual channel?
• Difference between the communication and transmission?
• What is the difference between TFTP and FTP application layer protocols?
• What are the advantages and disadvantages of the three types of routing tables?
• What is Beaconing?
• What does the Mount protocol do ?
• What are Digrams and Trigrams?
• What is the HELLO protocol used for?
• What is the minimum and maximum length of the header in the TCP segment and IP datagram?
• What do you meant by "triple X" in Networks?
• What is attenuation?
• What is Protocol Data Unit?
• What are the data units at different layers of the TCP / IP protocol suite?
• What is difference between ARP and RARP?
• What is MAC address?
• What is terminal emulation, in which layer it comes?
• What are the types of Transmission media?
• What are major types of networks and explain?
• What is SAP?
• What is multicast routing?
• What is the difference between routable and non- routable protocols?
• What is REX?
• What are the different type of networking / internetworking devices?
• What is redirector?
• What is packet filter?
• What is logical link control?
• What is traffic shaping?
• What is NETBIOS and NETBEUI?
• Why should you care about the OSI Reference Model?
• What is Proxy ARP?
• What is EGP (Exterior Gateway Protocol)?
• What is IGP (Interior Gateway Protocol)?
• What is OSPF?
• What is Kerberos?
• What is SLIP (Serial Line Interface Protocol)?
• What is Mail Gateway?
• What is RIP (Routing Information Protocol)?
• What is NVT (Network Virtual Terminal)?
• What is source route?
• What is BGP (Border Gateway Protocol)?
• What is Gateway-to-Gateway protocol?
• What is Project 802?
• What is silly window syndrome?
• What is a Multi-homed Host?
• What is autonomous system?
• What is the difference between interior and exterior neighbor gateways?
• What is MAU?
• Explain 5-4-3 rule.?
• What is difference between baseband and broadband transmission?
• What is ICMP?
• What is Brouter?
• What is frame relay, in which layer it comes?
• What is External Data Representation?
• What is Bandwidth?
• What protocol is used by DNS name servers?
• What is the range of addresses in the classes of internet addresses?
• What are the important topologies for networks?
• Difference between bit rate and baud rate?
• What is anonymous FTP and why would you use it?
• What is the difference between an unspecified passive open and a fully specified passive open?
• What is virtual path?
• Explain the function of Transmission Control Block?
• What is a DNS resource record?
• What is a pseudo tty?
• What is the Network Time Protocol?
• What is mesh network?
• What is RAID?
• What is a Management Information Base (MIB)?
• What is cladding?
• What is subnet?
• What is subnet?
• What is point-to-point protocol?
• What are 10Base2, 10Base5 and 10BaseT Ethernet LANs ?
• What are the possible ways of data exchange?
• What are the two types of transmission technology available?
• How do I convert a numeric IP address like 192.18.97.39 into a hostname like java.sun.com?