CCNA:ICND2 vocab - sec 2
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A concept in IPv4 addressing that defines a sub netted IP address as having three parts: network, subnet, and host.
A variation of the IPv4 forwarding (routing) process that defines the particulars of how the default route is used only if the classful network in which the packet's destination address resides is missing from the router's routing table.
classful routing protocol
An inherent characteristic of a routing protocol. Specifically, the routing protocol does not send subnet masks, in its routing updates. This requires the protocol to make assumptions about classful networks and makes it unable to support VLSM and manual route summarization.
A concept in IPv4 addressing that defines a subnetted IP address as having two parts: a prefix (or subnet) and a host.
A variation of the IPv4 forwarding (routing) process that defines the particulars of how the default route is used. The default route is always used for packets whose destination IP address does not match any other routes.
classless routing protocol
An inherent characteristic of a routing protocol. Specifically, the routing protocol sends subnet masks in its routing updates, thereby removing any need to make assumptions about the address in a particular subnet or network. This allows the protocol to support VLSM and manual route summarization.
An IOS command in which the 'ping' command accepts many other options besides just the destination IP address.
secondary IP address
The second (or more) IP address configured on a router interface, using the 'secondary' network on the 'ip address' command.
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 0 subnet can be easily identified because it is the same number as the classful network number.
A routing protocol feature in which a router that connects to more than one classful network advertises summarized routes for each entire classful network when sending updates out interfaces connected to other classful networks.
An IPv4 Class A, B, or C network. It is called a classful network because these networks are defined by the class rules for IPv4 addressing.
In IPv4, a internetwork design in which packets being forwarded between any two subnets of a single classful network only pass through the subnets of that classful network.
In IPv4, a internetwork design in which packets being forwarded between two subnets of a single classful network must pass through the subnets of another classful network.
An (incorrect) IP subnet design condition in which one subnet's range of addresses includes addresses in the range of another subnet.
A route created via configuration commands to represent routes to one or more subnets with a single route, thereby reducing the size of the routing table.
Variable-Length Subnet Mask (VLSM)
The ability to specify a different subnet mask for the same Class A, B, or C network number on different subnets. VLSM can help optimize available address space.
extended access list
A list of IOS 'access-list' global configuration commands that can match multiple parts of an IP packet, including the source and destination IP address and TCP/UDP ports, for the purpose of deciding which packets to discard and which to allow through the router.
named access list
An ACL that identifies the various statements in the ACL based on a name, rather than a number.
standard access list
A list of IOS global configuration commands that can match only a packet's source IP address for the purpose of deciding which packets to discard and which to allow through the router.
The mask used in Cisco IOS ACL commands and OSPF and EIGRP 'network' commands.
A type of ACL that goes beyond traditional IP ACLs to dynamically permit traffic from a host if the host's user first connects to the router via Telnet and passes an authentication process.
A type of ACL that goes beyond traditional IP ACLs to monitor the addition of new user sessions. The router reacts to add an ACL entry that matches the session's IP addresses and TCP/UDP port numbers.
From one host's perspective, the route over which a packet travels from that host to some other host.
From one host's perspective, for packets sent back to the host from another host, the route over which the packet travels.
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