ITM 301 Lecture Notes - Lecture 13: Nslookup, Wide Area Network, Dynamic Host Configuration Protocol

• School: Ryerson University
• Department: Information Technology Management
• Course: ITM 301
• Professor: Farid Shirazi

Document Summary

Transport: map osi layers to tcp/ip layers. Application, presentation, session is mapped to application of tcp/ip: tcp vs. udp, tcp: is a connection-oriented protocol. It does guarantee message delivery or in other words it handles errors: udp: is a connectionless oriented protocol that is widely used with broadcast and multicast. It is faster than tcp because it does not handles errors. 2 versions of ip version 4 default are: 32-bit, 4 octet 0. 25. Subnet: separates a net address from a given ip address. Dhcp assigns an ip for 8 days: dns port #53. Ip-to-name resolution (reverse name resolution) ptr: dns records: Nslookup typ=mx querys www. gmail. com: dynamic update. Client -> dhcp server (assigns ip) -> dns (updates) -: tcp/ip commands. Tracert: returns max # of hops which is 30 after that it timesout. Defined mesh topology with max number of links n*(n-1)/2. X. 25 is the oldest packet switching protocol for remote access.