SOLARIS NETWORK ENVIRONMENT:

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Application Layer: Represents the user level. TELNET,FTP,SMTP, NFS

Presentation Layer: Diff computers interpret info in diff ways. This layer facilitates encoding and decoding required bet platforms. Ex ASCII and EBCDIC. XDR(external data representation) resides at this layer.

Session Layer: Manages services like auth, dialog mgmt and encryption bet connected clients. It also reestablishes interrupted conn.

Transport Layer: Handles transport specific fns like flow control and quality bet 2 comm stations.

N/W layer: addresses, routes and delivers data traffic on a n/w. Routing tables are found at this layer.

Data Link Layer: This layer addresses physical medium directly. Checksum error detection occurs here. MAC addresses are used here.

Physical Layer: Operating at the lowest level, this layer moves unstructured bit streams using electrical signals.

1. App Layer : User accessed app programs and n/w services.

2. Transport Layer: Connection-oriented TCP and connectionless UDP data transfer.

3. Internet Layer: Here data is fragmented, addressed and routed.

4. N/w Layer: Error detection and packet framing. 802.3, 802.4, 802.5

5. Hw Layer: Contains electrical signals that move raw bits through the ether.

Ethernet is an implementation of CSMA/CD. Hosts that share a subnet transmit data to other hosts at random intervals.

ARP maps a 32 bit IP to a 48 bit MAC address.

RARP maps a 48 bit MAC address to 32 bit IP address.

#ifconfig -a

A process rpcbind, interprets incoming requests and sends them to the appropriate  server processes.

Using RPC, clients are given the actual port number at conn. time by rpcbind. RPC services register

themselves with rpcbind when they start, and are assigned an available port # at that time.

RPC services are named rpc.<daemon>

The configured ports for RPC are listed in /etc/rpc.

To see which services are currently running, use the rpcinfo -p cmd

rpcinfo can also start/stop n/w services. To reregister n/w services that have been stopped

send a hangup (HUP) signal to the inetd process.

 

#pkill -HUP inetd

and then verify the n/w services is available using rpcinfo -p

To stop a n/w services, use rpcinfo in the following manner:

#rpcinfo -d mountd l