Monthly Archives: March 2009

Trouble shoot domain name issue using nslookup

Posted on March 29, 2009 by admin

nslookup is a computer program used in Windows and Unix to query Domain Name System (DNS) servers to find DNS details, including IP addresses of a particular computer, MX records for a domain and the NS servers of a domain. … Continue reading →

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Study of ARP using Wireshark

Posted on March 28, 2009 by admin

Wireshark is a very useful tool for the study of network protocol! In my previous post on ARP, we have learned some basic about the ARP protocol. Let’s look more detail into the ARP request packet in this post. When … Continue reading →

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ARP resolves MAC address from IP address

Posted on March 27, 2009 by admin

A PC in an Ethernet network can communicate with another PC, if only it knows the Ethernet address (MAC address) of that PC. Address Resolution Protocol (ARP) is a network protocol uses to translate a PC’s IP address to physical … Continue reading →

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Switch as Intelligent Hub

Posted on March 23, 2009 by admin

In an Ethernet network, every client, server and network device is wired to a hub or switch. However, what is the different between hub and switch? In a word: intelligence. Answer this in short sentence: Hub versus Switch – Shared … Continue reading →

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Protocol Data Unit (PDU) – Process of Network Data Encapsulation

Posted on March 22, 2009 by admin

Within the layer in the OSI Reference Model, the communication between layers higher than layer one is logical; the only hardware connection is at the physical layer. Communication take the form of some sort of message that is sent between … Continue reading →

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