CCENT vocab - sec 3

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shamgar_bn
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224457
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CCENT vocab - sec 3
Updated:
2014-05-20 21:06:58
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Cisco CCENT ICND1 CCNA Vocab
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Description:
Vocabulary for section 3 of Cisco's CCNA/CCENT ICND1
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  1. bitwise Boolean AND
    A Boolean AND between two numbers of the same length in which the first bit in each number is ANDed, and then the second bit in each number, and then the third, and so on.
  2. Boolean AND
    A math operation performed on a pair of one-digit binary numbers. The result is another one-digit binary number. 1 AND 1 yields 1; all other combinations yield 0.
  3. broadcast subnet
    When subnetting a Class A, B, or C network, the one subnet in each classful network for which all subnet bits have a value of binary 1. The subnet broadcast address in this subnet has the same numeric value as the classful network's network-wide broadcast address.
  4. classful network
    An IPv4 Class A, B, or C network; called a classful network because these networks are defined by the class rules for IPv4 addressing
  5. default mask
    The mask used in a Class A, B, or C network that does not create any subnets; specifically, mask 255.0.0.0 for Class A networks, 255.255.0.0 for Class B networks, and 255.255.255.0 for Class C networks
  6. prefix notation/CIDR notation
    A shorter way to write a subnet mask in which the number of binary 1s in the mask is simply written in decimal. For instance, /24 denotes the subnet mask with 24 binary 1 bits in the subnet mask. The number of bits of value binary 1 in the mask is considered to be the prefix length
  7. private IP address
    IP addresses in several Class A, B, and C networks that are set aside for use inside private organizations. These addresses, as defined in RFC 1918, are not routable through the Internet
  8. public IP address
    An IP address that is part of a registered network number, as assigned by an Internet Assigned Numbers Authority (IANA) member agency, so that only the organization to which the address is registered is allowed to use the address. Routers in the Internet should have routes allowing them to forward packets to all the publicly registered IP addresses
  9. subnet
    Subdivisions of a Class A, B, or C network, as configured by a network administrator. Subnets allow a single Class A, B, or C network to be used instead of multiple networks, and still allow for a large number of groups of IP addresses, as is required for efficient IP addressing
  10. subnet mask
    A 32-bit number that numerically describes the format of an IP address by representing the combined network and subnet bits in the address with mask bit values of 1, and representing the host bit in the address with mask bit values of 0.
  11. subnet number/subnet address
    In IPv4, a dotted decimal number that represents all addresses in a single subnet. Numerically, the smallest value in the range of numbers in a subnet, reserved so that it cannot be used as a unicast IP address by a host.
  12. zero subnet
    For every classful IPv4 network that is subnetted, the one subnet whose subnet number has all binary 0s in the subnet part of the number. In decimal, the zero subnet can be easily identified because it is the same number as the classful network number
  13. bandwidth
    A reference to the speed of a networking link. Its origins come from earlier communications technology in which the range, or width, of the frequency band dictated how fast communications could occur
  14. boot field
    The low-order 4 bits of the configuration register in a Cisco router. The value in the boot field in part tells the router where to look for a Cisco IOS image to load.
  15. clock rate
    The speed at which a serial link encodes bits on the transmission medium
  16. configuration register
    In Cisco routers, a 16-bit, user-configurable value that determines how the router functions during initialization. In software, the bit position is set by specifying a hexadecimal value using configuration commands.
  17. IOS image
    A file that contains the IOS
  18. power-on self-test (POST)
    The process on any computer, including routers and switches, in which the computer hardware first runs diagnostics on the required hardware before even trying to load a bootstrap program
  19. ROMMON
    A shorter name for ROM Monitor, which is a low-level operating system that can be loaded into Cisco routers for several seldom needed maintenance tasks, including password recovery and loading a new IOS when Flash memory has been corrupted
  20. RxBoot
    A limited function version of IOS stored in ROM in some older models of Cisco routers, for the purpose of performing some seldom needed low-level functions, including loading a new IOS into Flash memory when Flash has been deleted or corrupted
  21. administrative distance
    In Cisco routers, a means for one router to choose between multiple routes to reach the same subnet when those routes were learned by different routing protocols. The lower the administrative distance, the better the source of the routing information
  22. autonomous system
    An internetwork in the administrative control of one organization, company, or governmental agency, inside which that organization typically runs an Interior Gateway Protocol (IGP)
  23. backup static route
  24. balanced hybrid
    A term that refers to a general type of routing protocol algorithm, the other two being distance vector and link state. The Enhanced Interior Gateway Routing Protocol (EIGRP) is the only routing protocol that Cisco classifies as using a balanced hybrid algorithm
  25. classful routing protocol
    Does not transmit the mask information along with the subnet number, and therefor must consider Class A, B, and C network boundaries and perform auto summarization at those boundaries. Does not support VLSM
  26. classless routing protocol
    An inherit characteristic of a routing protocol, specifically that the routing protocol does not send subnet masks in its routing updates, thereby removing any need to make assumptions about the address in a particular subnet or network, making it able to support VLSM and manual route summarization
  27. convergence
    The time required for routing protocols to react to changes in the network, removing bad routes and adding new, better routes so that the current best routes are in all the routers' routing tables
  28. default route
    On a router, the route that is considered to match all packets that are not otherwise matched by some more specific route
  29. distance vector
    The logic behind the behavior of some interior routing protocols, such as RIP. Distance vector routing algorithms call for each router to send its entire routing table in each update, but only to its neighbors. Distance vector routing algorithms can be prone to routing loops but are computationally simpler than link-state routing algorithms
  30. Exterior Gateway Protocol (EGP)
    A routing protocol that was designed to exchange routing information between different autonomous systems
  31. Interior Gateway Protocol (IGP)
    A routing protocol designed for use within a single organization
  32. link state
    A classification of the underlying algorithm used in some routing protocols. Link-state protocols build a detailed database that lists links (subnets) and their state (up, down), from which the best routes can then be calculated
  33. metric
    A unit of measure used by routing protocol algorithms to determine the best route for traffic to use to reach a particular destination
  34. routing update
    A generic reference to any routing protocol's messages in which it sends routing information to a neighbor
  35. variable-length subnet masking (VSLM)
    The capacity to specify a difference subnet mask for the same Class A, B, or C network number on different subnets. VLSM can help optimize available address space
  36. ADSL
    Asymmetrical Digital Subscriber Line. One of many DSL technologies, ADSL is designed to deliver more bandwidth downstream (from the central office to the customer site) than upstream
  37. asymmetric
    A feature of many Internet access technologies, including DSL, cable, and modems, in which the downstream transmission rate is higher than the upstream transmission rate
  38. ATM
    Asynchronous Transfer Mode. The international standard for cell relay in which multiple service types (such as voice, video, and data) are conveyed in fixed-length (53-byte) cells. Fixed-length cells allow cell processing to occur in hardware, thereby reducing transit delays
  39. DSL
    Digital Subscriber Line. Public network technology that delivers high bandwidth over conventional telco local-loop copper wiring at limited distances. Typically used as an Internet access technology, connecting a user to an ISP
  40. inside global
    For packets sent to and from a host that resides inside the trusted part of a network that uses NAT, a term referring to the IP address used in the headers of those packets when those packets traverse the global (public) Internet
  41. inside local
    For packets send to and from a host that resides inside the trusted part of a network that uses NAT, a term referring to the IP address used in the headers of those packets when those packets traverse the Enterprise (private) part of the network.
  42. modem
    Modulator-demodulator. A device that converts between digital and analog signals so that a computer may send data to another computer using analog telephone lines. At the source, a modem converts digital signals to a form suitable for transmission over analog communication facilities. At the destination, the analog signals are returned to their digital form
  43. NAT
    Network Address Translation. A mechanism for reducing the need for globally unique IP addresses. NAT allows an organization with addresses that are not globally unique to connect to the Internet by translating those addresses into public addresses in the globally routable address space
  44. PAT
    Port Address Translation. A NAT feature in which one inside global IP address supports over 65,000 concurrent TCP and UDP connections
  45. PSTN
    Public Switched Telephone Network. A general term referring to the variety of telephone networks and services in place worldwide. Sometimes called POTS (Plain Old Telephone Service)
  46. symmetric
    A feature of many Internet access technologies in which the downstream transmission rate is the same as the upstream transmission rate
  47. telco
    A common abbreviation for telephone company

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