Dns And Snmp

D omain N ame S ystem S imple N etwork M anagement P rotocol Seyed Ali Marjaie 060322017

Domain names and IP addresses ,[object Object],[object Object],[object Object],[object Object],[object Object]

Before there was DNS …. ,[object Object],[object Object],[object Object],[object Object]

Resolver and name server ,[object Object],[object Object],[object Object],[object Object]

Design principle of DNS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

DNS Name hierarchy ,[object Object],[object Object],[object Object],[object Object],Managed by UofT Managed by ECE Dept.

Domain name system ,[object Object],[object Object],[object Object],[object Object]

Domain names ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Top-level domains ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Organizational top-level domains com Commercial organizations edu Educational institutions gov Government institutions int International organizations mil U.S. military institutions net Networking organizations org Non-profit organizations

Hierarchy of name servers ,[object Object],[object Object],[object Object],[object Object]

Authority and delegation ,[object Object],[object Object],[object Object],[object Object],[object Object]

DNS domain and zones ,[object Object],[object Object],[object Object],[object Object]

Primary and secondary name servers ,[object Object],[object Object],[object Object],[object Object],[object Object]

Root name servers ,[object Object],[object Object],[object Object]

Addresses of root servers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Domain name resolution ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Recursive and Iterative Queries ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Recursive queries ,[object Object],[object Object],[object Object],[object Object]

Iterative queries ,[object Object],[object Object]

Caching ,[object Object],[object Object],[object Object]

Resource Records ,[object Object],[object Object],[object Object]

Resource Records Max. age of cached data in seconds * Start of authority (SOA) record. Means: “This name server is authoritative for the zone Mylab.com” * PC4.mylab.com is the name server * hostmaster@mylab.com is the email address of the person in charge Name server (NS) record. One entry for each authoritative name server Address (A) records. One entry for each hostaddress

S imple N etwork M anagement P rotocol

SNMP is … ,[object Object],[object Object],[object Object],[object Object]

[object Object],[object Object],SNMP is …

SNMP Message Protocol ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

SNMP Communities ,[object Object],[object Object],[object Object]

SNMP SMI (Structure of Management Information) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example portion of MIB (from RFC 1213) -- the Interfaces group -- Implementation of the Interfaces group is mandatory for -- all systems. ifNumber OBJECT-TYPE SYNTAX INTEGER ACCESS read-only STATUS mandatory DESCRIPTION "The number of network interfaces (regardless of their current state) present on this system." ::= { interfaces 1 }

SNMP Message Encoding ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

ASN.1 Object Identifiers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Partial ASN.1 Object Identifier Tree (from: ASN.1 Complete, J. Larmouth, Open Systems Solutions, 1999)

Dns And Snmp

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