Interview Questions
Interview Questions
Interview Questions
Algorithm Complexity
• http://en.wikipedia.org/wiki/Sorting_algorithm
• What are the differences among router, switch, bridge and hub?
All of them are devices and are used in network. Their differences are:
* Router: Layer 3 device, can work on physical, data and network layer.
* Switch: Layer 2 device, can work on data link layer
* Bridge: Layer 2 device, can work on data link layer.
* Hub: Layer 1device, just a multi-port repeater and works on physical layer
OSI has 7 layers whereas TCP/IP has only 4 layers The upper 3 layers of the OSI model is
combined on the TCP/IP model.
OSI has: physical layer, data link layer, network layer, transport layer, session layer,
presentation layer and application layer TCP/IP has : Network layer, Internet layer, transport
layer and application layer.
• Mark one of the most important difference between TCP and UDP.
TCP is a connection-oriented and UDP is a connection-less protocol
• What is IPSec?
IPSec is "Internet Protocol Security". It is a suite of protocols for securing Internet
Protocol(IP) communications.
• You are in home. But you need to access the office server router. How can you
do that?
By using "Telnet"
• What is "Segment"?
"Segment" is a PDU (Protocol Data Unit) of Transport layer of OSI model.
• What is IPsec?
IPsec stands for "IP Security". The IPsec working group of the
IETF is developing standards for cryptographic authentication and
for encryption within IP. The base specifications are defined in
RFC's 1825, 1826 and 1827. Products that implement these are
beginning to appear.
IPsec stands for "IP Security". The IPsec working group of the
IETF is developing standards for cryptographic authentication and
for encryption within IP. The base specifications are defined in
RFC's 1825, 1826 and 1827. Products that implement these are
beginning to appear.
• What is IP?
• What is TCP/IP
TCP/IP is a name given to the collection (or suite) of networking protocols that have been
used to construct the global Internet. The protocols are also referred to as the DoD (dee-
oh-dee) or Arpanet protocol suite because their early development was funded by the
Advanced Research Projects Agency (ARPA) of the US Department of Defense (DoD).
TCP/IP is a name given to the collection (or suite) of networking protocols that have been
used to construct the global Internet. The protocols are also referred to as the DoD (dee-
oh-dee) or Arpanet protocol suite because their early development was funded by the
Advanced Research Projects Agency (ARPA) of the US Department of Defense (DoD).