N10-007.2 Flashcards
Trunk
In the context of an Ethernet network, this is a single physical or logical connection that simultaneously carries traffic for multiple VLANs. However, a trunk also refers to an interconnection between telephone switches, in the context of telephony.
Root Port
In an STP topology, every nonroot bridge has a single root port, which is the port on that switch that is closest to the root bridge, in terms of cost.
Supplicant
In a network using 802.1X user authentication, a supplicant is the device that wants to gain access to a network.
carrier-sense multiple access/collision detection (CSMA/CD)
Used on an Ethernet network to help prevent a collision from occurring and to recover if a collision does occur. CSMA/CD is only needed on half-duplex connections.
VLAN
A single broadcast domain, representing a single subnet. Typically, a group of ports on a switch is assigned to a single VLAN. For traffic to travel between two VLANs, that traffic needs to be routed.
Power over Ethernet (PoE)
Defined by the IEEE 802.3af and 802.3at standards, PoE allows an Ethernet switch to provide power to an attached device (for example, a wireless access point, security camera, or IP phone) by applying power to the same wires in a UTP cable that are used to transmit and receive data.
Designated Port
In an STP topology, every network segment has a single designated port, which is the port on that segment that is closest to the root bridge, in terms of cost. Therefore, all ports on a root bridge are designated ports.
Link Aggregation
As defined by the IEEE 802.3ad standard, link aggregation allows multiple physical connections to be logically bundled into a single logical connection.
Spanning Tree Protocol (STP)
Defined by the IEEE 802.1D standard, STP allows a network to have redundant Layer 2 connections while logically preventing a loop, which could lead to symptoms such as broadcast storms and MAC address table corruption.
Nondesignated Port
In STP terms, nondesignated ports block traffic to create a loop-free topology.
Full-Duplex
This connection allows a device to simultaneously transmit and receive data.
Authenticator
In a network using 802.1X user authentication, an authenticator forwards a supplicant’s authentication request on to an authentication server. After the authentication server authenticates the supplicant, the authenticator receives a key that is used to communicate securely during a session with the supplicant.
Default Gateway
The IP address of a router (or multilayer switch) to which a networked device sends traffic destined for a subnet other than the device’s local subnet.
Multicast
A multicast communication flow is a one-to-many flow.
Anycast
An anycast communication flow is a one-to-nearest (from the perspective of a router’s routing table) flow.