Andrew's Space – Trainer's Life

January 10, 2012

What is the difference between a port number and a protocol number?

Filed under: Networking — chengandrew @ 12:12 pm

Port numbers are use by TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) while Protocol numbers are reserved number used to identify protocols

(Interior Gateway Protocol)

Unreliable transportation

  • Routing Information Protocol (RIP v2) –  UDP port 520
  • Open Shortest Path First (OSPF) – IP Protocol 89
  • *Interior Gateway Routing Protocol (IGRP) – IP Protocol 9
  • *Enhanced Interior Gateway Routing Protocol (EIGRP) – IP Protocol 88
  • Intermediate System-to-Intermediate System Protocol (IS-IS) – Runs natively on layer 2 of OSI model (Ethernet/PPP)

*Cisco proprietary

(Exterior Gateway Protocol)

Reliable transportation

  • Border Gateway Protocol (BGP) – TCP port 179

BGP using TCP session

January 7, 2012

CTU 2012 – Windows Server 8 Active Directory Overview

Filed under: Uncategorized — chengandrew @ 1:05 pm

 This session discuss and demonstrate new Active Directory functionality that comes with Windows Server 8. Active Directory has been a crucial component of the server system upon authentication and access control. Let see how these new improvement help to ease the frustration and support our IT pros.

Agenda

• Dcpromo (Enhancement)
• AD GUI Recycle-Bin (Enhancement)
• Fine-grained password policies (Enhancement)
• Dynamic Access Control (AD Central Policy)
• AD based volume activation

Here’s the Slide: https://skydrive.live.com/#!/view.aspx?cid=7A652ADDF155994C&resid=7A652ADDF155994C%211972
                        Video: http://www.youtube.com/watch?v=arY9k9CJQwE&feature=youtu.be

December 8, 2011

Promote AD in Windows Server 8

Filed under: Download,SWUG — chengandrew @ 11:06 pm
Tags:

Hi All, 
       Finally the screenshot of Promote AD in Windows Server 8 is ready.

Here is the article I wrote: http://cid-7a652addf155994c.skydrive.live.com/self.aspx/Share/Promote%20AD%20in%20Windows%20Server%208.pdf

Install Windows Server 8 in Virtual Box

Filed under: Download,SWUG — chengandrew @ 2:28 am

Hi All, 
       Install Windows Server 8 serveral times. Only now got the time to create the screenshot.

Here is the article I wrote: http://cid-7a652addf155994c.skydrive.live.com/self.aspx/Share/Install%20Windows%20Server%208%20in%20Virtual%20Box.pdf

October 11, 2011

SINGAPORE MVPs’ GAZETTE

Filed under: MS Events,MS Events / MVP — chengandrew @ 2:04 pm

Singapore MVPs‟ Gazette is a publication of the SE Asia MVP Team exclusively distributed to Microsoft staff. And I am one of the lucky MVP to express my opinions and views in this gazette.

To read the full document, click the link to download the pdf: SingaporeMVPGazette

October 6, 2011

HP A-Series (Basic Configuration) – Lesson 2:Link Aggregation

Filed under: HP Networking — chengandrew @ 12:12 pm

Hi All, I have created a Video Demo on “HP A-Series (Basic Configuration) – Lesson 2: Link Aggregation ”. In the demonstration, I will show you how to configure Link Aggregation to have failover redundancy between links.

Click on the following link to view: http://www.youtube.com/watch?v=KBPOoBG-miw

October 3, 2011

HP A-Series (Basic Configuration) – Lesson 1:Different types of vlans

Filed under: HP Networking — chengandrew @ 6:22 pm

Hi All,
       I have created a Video Demo on “HP A-Series (Basic Configuration) – Lesson 1:Different types of vlans”. In the demonstration, I will show you how to configure between different types of Vlan.

Click on the following link to view: http://www.youtube.com/watch?v=FEYCCJKSCS4

March 16, 2011

Internet Control Message Protocol (ICMP)

Filed under: Networking — chengandrew @ 6:04 pm
Tags: ,

Hi All,

           ICMP “Echo-Request” packet is send during “Ping” to destination device. If destination device receives the packet, it will send return “Echo-Reply” packets.

Nowadays, many devices uses firewall or “Access control List” to block ICMP in order to prevent “Ping of Death – (Denial of Service attack)”. ICMP doesn’t use port but rather than code.

Echo-Reply – Code 0
Echo-Request – Code 8

What is the difference between “Layer3 routing switch” vs “Router”?

Hi All,
           So can I use Layer 3 switch to replace Router??  Often when this question is being raise, audience will give the following  answers stated below:

  • Yes, No or Maybe
  • Save cost as Router more expensive
  • Manageability – Switches are easier to handle or configure
  • Switch can support layer 2 and layer 3 so in term of performance and scalability is better
  • Switches are faster than Router cause:
       – Router packet switching in done on MicroProcessor
       – Layer 3 switch packet switching is done on “Application specific integrated circuit” (ASIC) chip
  • 

One of the main reason why I need Router:
        Most Layer 3 switches only support “Interior Gateway  Protocols” (IGP) stated below handling packets routing within an Autonomous System (AS) – “Routing Domain”.
–  “Routing Information Protocol” RIP”
– “Opens Shortest Path First” (OSPF)

Most Layer 3 switches does not support “Exterior Gateway Protocol” (EGP) like  “Border Gateway Protocol” BGP which handle routing outside Autonomous System, getting packets from your internal network to the Internet. On the Internet, you must use  BGP.

March 1, 2011

Why there isn’t IPv5?

Filed under: Networking,News and politics — chengandrew @ 1:47 pm
Tags: ,

 Hi All,
      While most of you are trying to transit from IPv4 to Ipv6 addressing, have you ever ask yourself: Why there isn’t IPv5?

Here is the article I wrote: http://cid-7a652addf155994c.office.live.com/self.aspx/Share/Why%20there%20isn%5E4t%20IPv5.pdf

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