How to enable Secure Network file system (NFS)?

66.How to enable Secure Network file system (NFS)?
Ans.
1. The default installation does not uses NFSv4 security enhancement by default.

2. There are some step to be carried out manually and they are as follow.

3. Enable secure NFS by adding the following line to /etc/sysconfig/nfs
Secure_NFS=no

4. Modify /etc/idmapd.conf and set the domain options to user domain and change
Nobody- User & Nobody –group options to nobody
Domain = example.com
[Mapping]
Nobody_User = nobody
Nobody_Group = nobody

5. For the above changes to be affected, restart the portmapper using following command
#service portmap restart

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Explain network classes.

43.Explain network classes. Ans. 1. TCP/IP network are 4 bytes long, called IP addresses and written in dotted-decimal notation. (ex. 192.168.166.5) 2. The decimal numbers must be within the numeric range of 0-255, each IPv4 addresses consist of 4 parts. 3. Each part should conform to the 1-byte requirement. 4. Depending on the value of the first byte of the address, IP addresses can be divided into classes. 5. Network classes are of 3 type and have some specific range • Class A 0-127 • Class B 128-191 • Class C 192-233 6. Class division enables us efficient use of the address numbers. 7. Assigned network numbers are maintained in a database managed by InterNIC to insure that each assignment is unique. 8. After obtaining a network number, the host numbers may be assigned as required, for data transfer ARP maps the IP address to the MAC address of the device. 9. Routers are used for transferring data between 2 devices, routers are default gateway ...

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