NETWORKING IN ASN 1 PROTOCOL APPLICATION
1 APPLICATION DNS: THE DOMAIN NAME SYSTEM Programs rarely refer to hosts, mailboxes and other resources either in binary or in decimal address format. ... Nevertheless, the network protocol can only understand binary addresses. ... They contain 1. ... Delivery is accomplished by having the non-Internet site make an arrangement with some Internet site to accept email for it and forward it using whatever the protocol the two of them agree on. ... 86400 IN MX 1 zephyr. ... 86400 IN MX 1 flits. ... 201 IN MX 1 rowboat IN MX 2 zephyr IN HINFO Sun Unix little-sister IN A 130. ... 7 SNMP- SIMPLE NETWORK MANAGEMENT PROTOCOL In early days of the ARPANET, if the delay to some host became unexpected large, the person detecting the problem would just run the ping program to analyse the packet delay. ... In May 1990, RFC 1157 was published the definition of SNMP (Simple Network Management Protocol) Version 1. ... The SNMP Model: The SNMP model of a managed network consists of four components: 1. ... A management Protocol Managed nodes can be hosts, routers, bridges, printers or any other devices capable of communicating status information to the outside world. ... The management station interacts with the agent using SNMP protocol. ... SNMP AND ASN.1 9 The heart of the SNMP model is the set of objects managed by the agent. ... To achieve this goal, ASN.1 is used. SNMP has some lexical conventions that are not entirely the same as pure ASN.1. The basic ASN.1 data types allowed in SNMP are as follows: Primitive type Meaning Code INTEGER Arbitrary length integer 2 BIT STRING A string of 0 or more bits 3 OCTET STRING A string of 0 or more unsigned byte 4 NULL A place holder 5 OBJECT IDENTIFIER An officially defined data type 6 OBJECT IDENTIFIER provides a way of identifying objects. ... 10 PART OF ASN.1 OBJECT NAMING TREE In the above figure, every arc has both a label and a number. ... Thus all SNMP MIB objects are identified by a label of the form: {ISO identified-organization(3)dod(6)internet(1) } or alternatively they can just be identified as: {1,3,6,1 . ... We can use ASN.1 to create new types from the basic one. This is by using 1. ... CHOICE ASN.1 defines a complex macro mechanism, which is heavily used in SNMP. ... SMI: STRUCTURE OF MANAGEMENT INFORMATION Here we discuss the part of ASN.1 which are used in SNMP. ... For example, if a router has lost exactly 232 packets, rather than reporting 0 (as like counters, they go full round and come to 0), it is better to report as 232 1. ... This information was moved to protocol specific MIB in SNMPv2. ... The EGP group is used for routers that support the exterior gateway protocol. ... 15 THE SNMP PROTOCOL: In SNMP protocol, the management station sends a request to an agent asking for specific information, or issues a command to update its state in a certain way. ... Data are sent using the ASN.1 transfer syntax.