Switch features, VLANs, routing protocols, wireless standards and device placement.
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- What is a VLAN?
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A Virtual LAN is a logical network segment that groups devices together regardless of physical location, allowing separate broadcast domains on one physical switch.- What is the difference between an access port and a trunk port?
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An access port connects to end devices and belongs to a single VLAN. A trunk port connects switches and carries traffic for multiple VLANs.- What does 802.1Q do?
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802.1Q is the IEEE standard for VLAN tagging that inserts a 4-byte tag into Ethernet frames to identify which VLAN the frame belongs to.- What is port security?
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Port security is a switch feature that limits and controls MAC addresses on a port to prevent unauthorized devices from connecting to the network.- What is Spanning Tree Protocol used for?
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STP prevents network loops and data corruption by blocking redundant switch paths, allowing only one active path between switches.- What is a BPDU in STP?
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A Bridge Protocol Data Unit is a message sent by switches running STP to detect and prevent network loops by sharing bridge priority information.- What is the native VLAN on a trunk port?
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The native VLAN is the default untagged VLAN on a trunk port, typically VLAN 1, used for traffic that arrives without a VLAN tag.- What is link aggregation?
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Link aggregation combines multiple physical switch ports into a single logical link to increase bandwidth and provide redundancy.- What is EtherChannel?
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EtherChannel is Cisco's proprietary method of link aggregation that bundles up to eight ports together into one logical connection.- What is LACP?
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Link Aggregation Control Protocol is an IEEE 802.3ad standard that dynamically negotiates port bundling between switches for EtherChannel.- What is Power over Ethernet?
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PoE is a technology that delivers electrical power along network cables to powered devices such as IP phones, cameras, and access points.- What is port mirroring?
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Port mirroring copies all traffic from one or more ports to another port for monitoring and analysis purposes.- What is inter-VLAN routing?
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Inter-VLAN routing allows devices in different VLANs to communicate by using a router to forward traffic between the VLANs.- What is the difference between dynamic and static routing?
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Static routing uses manually configured routes that do not change automatically. Dynamic routing uses protocols to automatically discover and adapt routes.- What is RIP?
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Routing Information Protocol is a distance-vector routing protocol that uses hop count as the metric, with a maximum of 15 hops.
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