chapter 5 vocabulary

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chapter 5 vocabulary
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2012-10-03 20:10:21
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chapter 5 ccna
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  1. ARP
    Address Resolution Protocol.  An internet protocol used to map an IP address to a MAC address.  Defined in RFC 826.
  2. Default Gateway / Default Router
    On an IP host, the IP address of some router to which the host sends packets when the packets destination address is on a subnet other than the local subnet.
  3. DHCP
    Dynamic Host Configuration Protocol.  A protocol used by hosts to dynamically discover and lease an IP address, and learn the correct subnet mask, default gateway, and DNS server addresses.
  4. DNS
    Domain Name System.  An application layer protocol used throughout the internet for translating hostname into their associated IP addresses.
  5. Host Part
    A term used to describe a part of an IPv4 address that is used to uniquely identify a host within a subnet.  The host part is identified by the bits of value 0 in the subnet mask.
  6. IP Address
    In IPv4 a 32-bit address assigned to hosts using TCP/IP.  Each address consists of a network number, an optional subnet number, and a host number.  The network and subnetwork numbers together are used for routing, and the host number is used to address an individual host within the network or subnetwork.
  7. Logical Address
    A generic reference to address as defined by layer 3 protocols, which do not have to be concerned wit the physical details of the underlying physical media.  Used mainly to contrast these address with data-link addresses, which are generically considered to be physical addresses because they differ based on the type of physical medium.
  8. Network Broadcast Address
    In IPv4 a special address in each classful network that can be used to broadcast a packet to all hosts in that same classful network.  Numerically, the address has the same value as the network number in the network part of the address, and all 255s in the host octets - for example, 10.255.255.255 is the network broadcast address for classful network 10.0.0.0.
  9. Network Number / Network Address
    A number that uses dotted decimal notation like IP addresses, but the number itself represents all hosts in a single class A, B or C network.
  10. Network Part
    The portion of an IPv4 address that is either 1, 2, or 3 octets / bytes long, based on whether the address is in a class A, B, or C network.
  11. Routing Table
    A list of routes in a router, with each route listing the destination subnet and mask, the router interface out which to forward packets destined to that subnet, and, as needed, the next hop routers IP address.
  12. Subnet Broadcast Address
    A special address in each subnet, specifically the largest numeric address in the subnet, designed so that the packets sent to this address should be delivered to all hosts in that subnet.
  13. 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 it cannot be used as a unicast IP address by a host.
  14. Subnet Part
    In a subnetted IPv4 address, interpreted with classful addressing rules, one of three parts of the structure of an IP address, with the subnet part uniquely identifying different subnets of a classful IP network.

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