Chapter 15 - IP Services Flashcards
first-hop redundancy protocol
A protocol that creates a virtual IP address on a router or a multi-layer device to ensure continuous access to a gateway when there are redundant devices.
inside global
The public IP address that represents one or more inside local IP addresses to the outside.
inside local
The actual private IP address assigned to a device on the inside network(s).
Network Address Translation (NAT)
The systematic modification of source and/or destination IP headers on a packet from one IP address to another.
NTP client
A device that queries a time server by using Network Time Protocol so that it can synchronize its time to the server.
NTP peer
A device that queries another peer device using Network Time Protocol so that the two devices can synchronize and adjust their time to each other.
NTP server
A device that provides time to clients that query it with Network Time Protocol.
outside local
The IP address of an outside host as it appears to the inside network. The IP address does not have to be reachable by the outside but is considered private and must be reachable by the inside network.
outside global
The public IP address assigned to a host on the outside network by the owner of the host. This IP address must be reachable by the outside network.
pooled NAT
A dynamic one-to-one mapping of a local IP address to a global IP addresses. The global IP address is temporarily assigned to a local IP address. After a certain amount of idle NAT time, the global IP address is returned to the pool.
Port Address Translation (PAT)
A dynamic many-to-one mapping of a global IP address to many local IP addresses. The NAT device keeps track of the global IP address-to-local IP address mappings using multiple different port numbers.
static NAT
A static one-to-one mapping of a local IP address to a global IP address.
stratum
A level that makes it possible to identify the accuracy of the time clock source, where the lower the stratum number, the more accurate the time is considered.
