Cisco readying collaboration software platform | Network World Asia |
- Cisco readying collaboration software platform | Network World Asia
- Two in a Row at VMworld - Data Center Networks
- Lowongan Kerja Network Service Metrodata Group September 2009
- Free ExamForce IT Certification Study Guide Bundle (Microsoft, CompTIA, Cisco) from TradePub
- education
- Cisco Systems, Inc. CSCO, Ends the trading day Down 1.99% Blogs …
- Cisco Firewall Mentor | Free Download Software Ebooks Games 0ydas …
- Five indicted in long-running cybercrime operation
- Security vendor Marshal8e6: Call us M86 Security
- The Wacky World of WiFi
- Anti-phishing training adds attachments to mix
- French Pirate Party will fight for parliamentary seat
- BitDefender’s top 10 e-threats for August
- Cisco UCS, Nexus 1000 virtual switches power VMworld labs
- Cisco, VMware create method for long-distance VMotion
- CCNA Exploration 1 – Module 3 Exam Answers
- The Bryant Advantage (2009-09-02 06:40)
- The Bryant Advantage (2009-09-02 06:09)
- Cisco Watch-Out
- How Hosts Use Subnet Masks
| Cisco readying collaboration software platform | Network World Asia Posted: 02 Sep 2009 03:48 PM PDT
The system will show workers their contacts, media, communities and key applications on one screen. Original post: |
| Two in a Row at VMworld - Data Center Networks Posted: 02 Sep 2009 02:57 PM PDT
I am happy to share that the Cisco Unified Computing System was just awarded Gold Award in the "Hardware for Virtualization" category at the Best of VMworld 2009 Awards. The system represents a lot of hardwork and commitment from a … See the original post: |
| Lowongan Kerja Network Service Metrodata Group September 2009 Posted: 02 Sep 2009 03:17 PM PDT
Network Service Dept.
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| Free ExamForce IT Certification Study Guide Bundle (Microsoft, CompTIA, Cisco) from TradePub Posted: 02 Sep 2009 02:40 PM PDT
Are you working your way through IT certifications or considering it? If so, you may want to check out this neat freebie from RedFlagDeals.TradePub.com, which is a no-cost trade magazine service
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| Posted: 02 Sep 2009 10:08 AM PDT |
| Cisco Systems, Inc. CSCO, Ends the trading day Down 1.99% Blogs … Posted: 02 Sep 2009 06:17 AM PDT
Cisco Systems, Inc. designs, manufactures and sells Internet protocol (IP)-based networking and other products related to the communications and information technology (IT) industry, and provides services associated with these products … More here: |
| Cisco Firewall Mentor | Free Download Software Ebooks Games 0ydas … Posted: 02 Sep 2009 04:53 AM PDT
The Cisco Firewall Video Mentor is an outstanding aide in learning to configure and understand the Cisco Adaptive Security Appliance. See more here: |
| Five indicted in long-running cybercrime operation Posted: 02 Sep 2009 09:00 AM PDT
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| Security vendor Marshal8e6: Call us M86 Security Posted: 02 Sep 2009 09:00 AM PDT
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| Posted: 02 Sep 2009 09:00 AM PDT
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| Anti-phishing training adds attachments to mix Posted: 02 Sep 2009 09:00 AM PDT
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| French Pirate Party will fight for parliamentary seat Posted: 02 Sep 2009 09:00 AM PDT
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| BitDefender’s top 10 e-threats for August Posted: 02 Sep 2009 09:00 AM PDT
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| Cisco UCS, Nexus 1000 virtual switches power VMworld labs Posted: 02 Sep 2009 09:00 AM PDT
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| Cisco, VMware create method for long-distance VMotion Posted: 02 Sep 2009 09:00 AM PDT
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| CCNA Exploration 1 – Module 3 Exam Answers Posted: 02 Sep 2009 07:31 AM PDT
1. What application layer protocol is commonly used to support for file transfers between a client and a server? • HTML • HTTP • FTP • Telnet 2
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| The Bryant Advantage (2009-09-02 06:40) Posted: 02 Sep 2009 06:40 AM PDT
Hi Group! I'll have a major posting here later today for all CCNA and CCNP candidates, along with all of my Network+ 2009 certification candidates as well - and in the meantime, click the links below to register for the September series of free CCNA and CCNP Webinars! You don't need a microphone or a credit card to attend - just an hour of your time and the desire to get certified! And I know you have that desire, or you wouldn't be here!
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| The Bryant Advantage (2009-09-02 06:09) Posted: 02 Sep 2009 06:09 AM PDT
Hi Group! It's Wednesday, September 2, and later today I'll be posting…. …
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| Posted: 02 Sep 2009 04:13 AM PDT
Cisco Watch-Out Alan Sulkin, an experienced market watcher, has published his 2Q09 North American view on Avaya, Cisco , IP PBX shares, Nortel, Sulkin. See original here: |
| Posted: 02 Sep 2009 02:09 AM PDT
This is a post for people new to networking that have just started learning IP addressing and the basis of routing and subnetting. Every host or device on a TCP/IP network MUST have an IP address assigned in order to communicate with other devices. An IP address consists of a network part and a host part. Think about the Network part as a multi dueling Building Address number, and the Host part as your apartment number inside this building. For example, building address "Building XYZ" is the network IP address part, and "Apartment number 2" is the host address part. For example IP address 10.0.0.2 which identifies a single host, contains the network part 10.0.0 and the host part 2. Now, how do devices on the network know which portion is the network part and which is the host part of their assigned IP address? They know this information using the "Subnet Mask". Every host on a TCP/IP network is configured with an IP address AND a subnet mask. The subnet mask is the one which identifies the Network Part portion of the IP address assigned to the host. For our example above, the host with IP 10.0.0.2 is assigned also a subnet mask 255.255.255.0. If you do a logical AND operation between the IP address and the subnet mask, you will find the Network potion of the address: 10.0.0.2 AND 255.255.255.0 = 10.0.0.0 (The network part is 10.0.0 and the remaining part is the host part. i.e 2 ). Let's see a diagram below:
From the picture above, Host A and Host B belong to the same local subnetwork (10.0.0.0/24) and are connected to the same switch together with a router interface. The router interface has also an IP address 10.0.0.254 with the same subnet mask 255.255.255.0 as the two Hosts. Also, two other hosts (Host C, Host D) belong to another subnetwork (10.1.1.0/24) together with the second interface of the router which has address 10.1.1.254. Each host has also a default gateway assigned (in addition to IP address and Subnet Mask). Hosts A and B must be configured with a default gateway address of the router interface which is 10.0.0.254. Similarly, Hosts C and D must be configured with a default gateway address of their router which is 10.1.1.254. How Hosts use the Subnet Mask When a host wants to communicate with another host, it uses its subnet mask to compare the network portion of its local network IP address with the destination network address of the packet to be sent. Before an end system can send a packet to its destination, it must first determine whether the destination address is on the local network. This is done by comparing the bits in the destination address with the network bits of its own IP address. For example, if Host A wants to send a packet to Host B, it will take the destination address 10.0.0.2 (Host B) and perform an AND operation with its subnet mask. The result will be 10.0.0.0 which will tell Host A that the destination address belongs to the same subnetwork as itself. Therefore it will NOT send the packet to the default gateway (router). Rather, Host A will perform an ARP request (Address Resolution Protocol) to find out the destination MAC address of Host B (ARP protocol maps an IP address with a MAC address). Therefore, Host A will send the packet directly to Host B through the switch without going through the router. Now, if Host A wants to send a packet to Host C, it will take the destination address 10.1.1.1 of Host C and perform an AND operation with its subnet mask. The result will be |
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