A logical unit number (LUN) can refer to an entire physical disk, or a subset of a larger physical disk or disk volume. The physical disk or disk volume could be an entire single disk drive, a partition (subset) of a single disk drive, or a disk volume from a redundant array of independent disks (RAID) controller comprising multiple disk drives aggregated together for larger capacity and redundancy. LUNs are an important factor in managing block storage arrays shared over a SAN. A LUN represents a logical abstraction or, if you prefer, virtualization layer between the physical disk device/volume and the applications

A computer is an electronic device that executed thousands of instructions within a second with the help of input and output devices.

back up refers to the copying and archiving of computer data
so it may be used to restore the original after a data loss
event with the help of external hard disc,network cable,usb
flash drive.. types are
1.system image backup..
2.system repair disk..

Yes we can use a pc as a router provided it has minimum two nic(network interface card) ports.One will be configure for the internal network and one to the external.

NFS performance to solaris clients is poor during write.

you have to check network connection between B and C may be
not reach in network

In synchronous mode (SRDF/S), the primary array waits until the secondary array has acknowledged each write before the next write is accepted, ensuring that the replicated copy of the data is always as current as the primary. However, the latency due to propagation increases significantly with distance.
Asynchronous SRDF (SRDF/A) transfers changes made to the secondary array in units called delta sets, which are transferred at defined intervals. Although the remote copy of the data will never be as current as the primary copy, this method can replicate data over considerable distances and with reduced bandwidth requirements and minimal impact on host performance.

TO CONIFIGURE STARTUP APPLICATION & BOOTING OPTIONS SUCH AS OS
PRIORITY, TIME FOR BOOTING.

In parallel communication data is transfered parallely
ex:1
0
0
1
in parallel communication each bit requires separate path
that means for example when we transfer data from source to
destination in single wire but in parallel communication
each bit require separate wire.so cost is very high
In serial communication data is transfered serialy
ex: 0 1 1 0 1
it requires single wire to transmit all the data.

just uncheck the proxy box from internet option and check
the automatic detect setting.

Network is only infrastructure and networking is the
functions that help to maintain the infrastructure in a
more effective way with equipments like router, switch, hub
etc…

• Increasing the Productivity of Users
• Reducing the Burden of IT Administration
• Improving Fault Tolerance to Minimize Downtime
• Enhancing Security to Provide Better Peace of Mind
• Leveraging the Capabilities of Active Directory-enabled
Applications