CCNA Vocabulary_A.txt

  1. 4b/5b
    An encoding scheme 4B/5B uses 5-bit symbols and codes to represent 4 bits of data. 4B/5B is used in 100Base-tx ethernet.
  2. ACK
    a 1-bit flag in the tcp header that indicates the acknowledgment field is valid.
  3. acknowledgment
    a notification sent from one network device to another to confirm that some event has occured.
  4. acknowledgment number
    a 32-bit field in the tcp segment header that specifies the sequence number of the next byte this host expects to receive as a part of the TCP session. It is used to recognize lost packets and flow control
  5. address pool
    the range of ip addresses that can be assigned by the DHCP server.
  6. Address Resolution Protocol (ARP)
    the method of for finding a host's hardware address from its IPv4 network layer address.
  7. administratively scoped address
    an IPv4 multicast address that is restricted to a local group or organization
  8. AND
    one of the three basic binary logic operations. ANDing yields the following result: 1 and 1 = 1, 1 and 0 = 0, 0 and 1 = 0
  9. argument
    additional data that is provided with a command to provide information used by the execution of the command. IOS command arguments are entered at the CLI after the command
  10. ARP cache
    a logical storage in the host's RAM to store ARP entries
  11. ARP poisoning
    a technique used to attack an ethernet network by sending fake ARP messages to an ethernet LAN. These frames contain false MAC addresses that confuse network devices, such as switches. As a result, frames intended for one node can be mistakenly sent to another node.
  12. ARP table
    a logical storage in a host's RAM to store arp entries.
  13. association identity AID
    a number used in the 802.11 header to specify the session between a wireless client and the access point.
  14. asynchronous
    communication that does not use a common clock between the sender and receiver. To maintain timing, additional information is sent to synchronize the receive circuit to the incoming data. For ethernet at 10MBPS, the ethernet devices do not send electrical signals for synchronization
  15. attenuation
    the loss of communication signal on the media. This loss is due to degradation of the energy wave over time.
  16. authentication
    a process used to verify the identity of a person or process
  17. authoritative
    a source of information that is highly reliable and known for its accuracy
Card Set
CCNA Vocabulary_A.txt
CCNA Vocab A