CCENT (Cisco Certified Entry Network Technician) Certification Exam Notes

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About CCENT certification: CCENT - Cisco Certified Entry Networking Technician is an entry level Cisco certification. Getting CCENT certified ensures that the candidate has enough knowledge to plan, configure, and operate simple WAN and switched LAN networks using Cisco products. No pre-qualification is necessary to take CCENT exam. 640-822 is the only exam necessary to pass for obtaining CCENT certification. 640-822 is required for achieving CCNA, which covers medium size enterprise branch networks with more complex connections.

1. The 7 layers of OSI model are :

2. By implementing VLANs,

3. HTTP is the protocol used for accessing the World Wide Web services. HTTP operates over TCP/IP. TCP/IP is the protocol, which is used by all internet applications such as WWW, FTP, Telnet etc. IPX/SPX is proprietary protocol stack of Novell NetWare.

4. To verify vtp configuration on a Cisco switch, "show vtp" privileged executive command can be used. This command displays, among other things, VTP domain name, VTP password if any, VTP pruning mode (enabled or disabled) and the IP address of the device that last modified the configuration.

5. WANS are connected over serial lines and typically operate at lower speeds than LANs, and more expensive. Some of the WAN terms are:

6. "sh int <interface_no> " is a very usefull command. It displays the following information:

7. If a properly configured workstation is unable to access the network information, it is likely that the DHCP information available with the client workstation had become obsolete. Issuing ipconfig command with /release and /renew commands will enable the client workstation to obtain latest changes to the DHCP server.

8. Some Important Cable Types Used Frequently:

  1. A straight-through cable is what you normally use to connect a PC to a hub or switch
  2. A crossover cable is a special type of Ethernet cable used to connect a PC to a PC or a switch to a switch
  3. A rolled cable isn’t actually an Ethernet cable, but looks like one. It is used to connect a PC to a switch’s console port, for management. This cable is normally used when configuring a Cisco switch or a router for the first time.

9. Few Important things to note about OSI layer functions:

  1. Application layer is responsible for ensuring the availability of intended communication partner. This layer is also responsible for synchronizing sending and receiving applications.
  2. Presentation Layer is responsible for negotiating data transfer syntax.
  3. Session layer is responsible for co-coordinating communication between systems
  4. Transport layer is responsible for multiplexing upper-layer applications. It is also responsible for establishment and tear down of virtual circuits.

10. 100BaseT (Fast Ethernet) uses IEEE803.2u standard which incorporates CSMA/CD protocol.

11. 10Base2, and 10Base5 use coaxial cable for transmission of digital signals. Therefore, it can’t support simultaneous transmission and reception. On the other hand, 10BaseT and 100BaseT use RJ-45 connectors and Cat 3/4/5 cables. These cables have multiple pairs of wires, and hence support full duplex transmission (Note that the other parts of the network should also support full duplex, like the network card).

12. Consider a host IP156.16.3.47: The available hosts with a 11 bit subnet mask, may be computed as below:

11 bit subnet mask is equivalent to 255.255.255.224; It will accommodate 2,046 subnets, each with 30 hosts. The host address of 156.16.3.47 is in the 32 subnet range. The valid hosts for subnet 32 are 33-62. The broadcast address is 63.

13. To find the subnet that a host 56.16.3.52 with 12-bit subnet mask belongs to:

A 12-bit subnet mask gives us 255.255.255.240; 4094 subnets, each with 14 hosts. (Host addresses of all zeros and all 1s can't be assigned). The 156.16.3.52 is in the 48 subnet range. The valid range is through 49 - 62. 63 is a broadcast address.
Here is how you get the subnet range:
1. Find the subnet mask. In this case, default subnet mask for Class B address is 255.255.0.0. There are additional; 12 bits in the subnet mask. Now the subnet mask looks like:
11111111.11111111.11111111.11110000. This is equal to 255.255.255.240.0.
2. Now, deduct the lowest value octet (Which is non zero), from 256. Here, (256-240)=16.
This is the value that the subnets are incremented. Therefore, you will have hosts with values from:.
156.16.3.1 to 156.16.3.14 (All 0s and all 1s host addresses can not be used)
156.16.3.17 to 156.16.3.30
156.16.3.33 to 156.16.3.46
156.16.3.49 to 156.16.3.62 and so on.
It is important to know that subnets are incrementing by a factor of 16.

14. 127.0.0.1 is the local loopback address defined by the Internet Protocol and used for by a host to ping itself to verify the IP connectivity.

15. Important Layer 2 LAN protocols types:

Note that 802.3, and 802.5 are examples of layer 2 LAN protocols, whereas, HDLC, PPP are examples of layer 2 WAN protocols.

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