ethernet Flashcards
Your co-worker has just installed an unmanaged 24-port switch. He is concerned with the amount of broadcast traffic that may exist when using this device. How many broadcast domains are created when using this single 24-port switch?
A single 24-port unmanaged switch will have only 1 broadcast domain. Routers and VLANs split up broadcast domains. Since this is an unmanaged switch, it will only have a single broadcast domain, but it will have 24 collision domains. If this was a managed layer 3 switch, it could provide routing functions and break apart the broadcast domains. But, since this was an unmanaged switch, there must be only 1 broadcast domain on this switch.
A technician needs to limit the amount of broadcast traffic on a network and allow different segments to communicate. Which of the following should the technician install to satisfy this requirement?
By adding a multilayer (layer 3) switch, the technician can improve network routing performance and reduce broadcast traffic. Creating a VLAN provides LAN segmentation, as well, within the network and the multilayer switch can conduct the routing between VLANs as needed. Just adding a single router would only create two broadcast domains, but adding the multilayer switch and configuring VLANs would allow you to add as many broadcast domains as you need. Each VLAN is its own broadcast domain.
You have been asked by your supervisor, Tamera, to ensure that you enable 802.3af on a managed switch. Which of the following features does she want you to enable?
The IEEE 802.3af standard defines power over Ethernet (PoE) and supports 15.4W of DC power to each device. The IEEE 802.3at standard defines PoE+ and supports 25.5W of DC power to each device. Power over Ethernet or PoE technology describes a system to safely transfer electrical power, along with data, to remote devices over standard data cables in an Ethernet network.
Which of the following technologies allows two or more links to pass network traffic as if they were one physical link?
The Link Aggregation Control Protocol (LACP) enables you to assign multiple physical links to a logical interface that will appear as a single link to a route processor. LACP is used to combine multiple network connections in parallel to increase throughput beyond what a single connection could sustain and to provide redundancy in case one of the links should fail. LACP is defined in the IEEE 802.3ad standard.
Which of the following IEEE specifications describes the use of the spanning tree protocol (STP)?
The Spanning Tree Protocol (STP) is a network protocol that builds a loop-free logical topology for Ethernet networks to prevent bridge loops and the broadcast storms that result from them. STP is defined in the IEEE 802.1d standard.
What type of VLAN allows voice over IP (VoIP) frames to be treated with higher priority than data frames?
A voice VLAN allows an IP phone that is daisy chained to an attached PC to mark voice frames with a higher Class of Service (CoS) marking than data frames sent by the attached PC. That allows both voice and data frames to flow over the same connection into a single switch port, while distinguishing between the voice and data frames.
What is the MTU size for Jumbo frames?
The MTU (Maximum Transmission Unit) is the maximum amount of data that can be transmitted within a single packet. The default MTU size for a Jumbo frame is 9000 bytes.
Which of the following devices performs routing between VLANs without the use of an external device such as a router?
A multilayer switch (MLS) is a switch that can make forwarding decisions on more than just L2 addresses. Typically multilayer switches can also perform routing functions without the use of a dedicated router. A normal switch can only make forwarding decisions based on L2 addresses, not L3.
A security engineer believes malicious traffic has been passing through the network. Because of this, he wants to monitor traffic on a specific VLAN. Which of the following features should he implement on the switch to best achieve this?
port Mirroring also referred to as SPAN (Switchport Analyzer) allows a switch to copy frames sent/received on one port to be sent out a different port for traffic monitoring. A protocol analyzer is used to interpret network traffic originating from a port or another source of traffic.
Which of the following is an open standard trunking protocol that allows information from multiple VLANs to pass through a single link?
IEEE 802.1Q is an open standard trunking protocol. Trunks are links that carry information from multiple VLANs. Trunk Links use VLAN Tags to differentiate between the VLANs being carried.
A network technician is looking to purchase a new switch for the network. One of the requirements is for the switch to support layer 2 loop prevention. Which of the following protocols should the switch support to achieve this requirement?
Spanning Tree Protocol (STP) is a protocol used to detect and prevent layer 2 loops through the use of BPDUs (Bridge Protocol Data Units). This protocol does this by blocking redundant paths
Rene, a wiring technician, has been told he needs to install a new AP at a warehouse. When he goes to inspect the building, he notices the power cable included with the AP is not long enough to reach the nearest power source. Which of the following features would best help overcome the distance limitation and power the AP?
PoE (Power over Ethernet) is a set of standards used to provide power to devices over an Ethernet cable without the use of an external power source. A PoE supported switch can be configured to provide power to APs (Access Points), Phones, surveillance cameras, and smart devices.
A technician is installing a new PoE enabled device in an office. The power requirement for the device is 25 Watts of power. Which of the following Standards would at minimum fit the need?
PoE (Power over Ethernet) is a set of standards used to provide power to devices over an Ethernet cable without the use of an external power source. PoE has 3 popular industry standards: 802.3af, 802.3at, and 802.3bt. 802.3af only supports up to 15.4 Watts of power. 802.3at supports up to 25.5 Watts of power.
You need to configure a network with a NAS to be able to transfer more than 1500 bytes of data per frame. What type of frame should the devices in the network support?
A Network Attached Storage (NAS) is a server that provides access to file storage through a Local Area Network (LAN). A jumbo frame is a frame with an MTU (Maximum Transmission Unit) greater than 1500 bytes. In this case, the max MTU for a Jumbo frame is 9000 bytes.
