cisco netacad ch3
Define the components in the notation 100Base-T to the specification 100________ Base____________ -T_______________
100(speed in mbps) Base (Baseband transmission) -T(Twisted pair cable)
When a computer assembles a frame to be sent over the network, what is the maximum size of an Ethernet frame?
1518 bytes (Ethernet standards define a frame size with a minimum of 64 bytes and a maximum of 1518 bytes including fields of destination MAC address, source MAC, Length/Type, data payload, and FCS.)
Application Transport Internet Network access
4 layer model (TCP\IP)
broadcast domain
A broadcast domain is a logical division of a computer network, in which all nodes can reach each other by broadcast at the data link layer. A broadcast domain can be within the same LAN segment or it can be bridged to other LAN segments.
Reference model
A layered model that describes the functions that must occur at the various layers, but not the specific protocol that must preform the function.
OSI model
A reference model that illustrates what functionality is necessary in order for network communications to occur
ARP
Address Resolution Protocol ( Resolves IP addresses to MAC addresses. ARP poisoning attacks can redirect traffic through an attacker's system by sending false MAC address updates. VLAN segregation helps prevent the scope of ARP poisoning attacks within a network. layer 2.5)
the table that stores source MAC addresses in a switch
CAM (Content Addressable Memory) is memory that can be addressed by content, rather than a numeric memory address. You can look up the interface by presenting the memory with the MAC address. This is done in a single CPU cycle vs. the traditional programming of searching through a table, which will cost many CPU cycles.
What makes it possible for e-mail to be sent and received on a wide variety of devices, including cell phones, PDAs, laptops, and desktop computers?
E-mail software is written using standards and protocols that ensure compatibility.
Broadcast MAC Address
FF-FF-FF-FF-FF-FF
The_______is an organization that develops and maintains Ethernet and wireless standards.
IEEE (Institute of Electrical and Electronic Engineers )
What type of information is contained in an ARP table?
IP address to MAC address mappings (ARP tables are used to store mappings of IP addresses to MAC addresses. When a network device needs to forward a packet, the device knows only the IP address. To deliver the packet on an Ethernet network, a MAC address is needed. ARP resolves the MAC address and stores it in an ARP table.)
Internet Standards organization
ISO, IEEE, ICANN, IANA, IETF
The_______ address is a physical address assigned to every Ethernet network interface.
MAC (Media Access Control)
the 6 elements of protocol are: Timing Message size Encapsulation -------------- Encoding Message pattern
Message format
Fill in the blank. The________________model breaks network communications down into seven functional layers.
OSI (open systems interconnection)
Application, Presentation, Session, Transport, Network, Data Link, Physical
OSI model
PDU
Protocol Data Unit
Packets
Small chunks of information that have been carefully formed from larger chunks of information.
Frame Addressing
Source and Destination MAC address
Access Layer
The access layer provides a connection point for end user devices to the network and allows multiple hosts to connect to other hosts through a network device, usually a switch or access point. Typically, all devices within a single access layer will have the same network portion of the IP address. If a message is destined for a local host, based on the network portion of the IP address, the message remains local. If it is destined for a different network, it is passed up to the distribution layer. Switches provide the connection to the distribution layer devices, usually a router.
Core Layer
The core layer is a high-speed backbone layer with redundant (backup) connections. It is responsible for transporting large amounts of data between multiple end networks. Core layer devices typically include very powerful, high-speed switches and routers. The main goal of the core layer is to transport data quickly.
Distribution Layer
The distribution layer provides a connection point for separate networks and controls the flow of information between the networks. It typically contains more powerful switches than the access layer as well as routers for routing between networks. Distribution layer devices control the type and amount of traffic that flows from the access layer to the core layer.
message destination
The intended recipient of the message on the network
message channel
The media over which the message is transmitted from source to destination.
Tcp/ip model
The model that shows the intropperation of the protocols that govern internet communications.
Encapsulation
The process of adding additional information to the pieces of data that make up the message in order to ensure that it is delivered to the correct application on the correct destination host.
encoding
The process of translating the bits of data into a pattern of sounds,light waves, or electrical impulses for transmission over a network.
Distribution Layer
This layer interconnects the smaller local networks.
Core Layer
This layer provides a high-speed connection between distribution layer devices.
Access Layer
This layer provides connections to hosts in a local Ethernet network.
protocol stacks add in the order of highest to lowest to enable different levels to be applied at the same time.
YES
protocol model
a layered model that illustrates how different related protocols interact within a protocol suite.
What address type does a switch use to make selective forwarding decisions?
destination MAC
Which term is used to refer to a Layer 2 PDU?
frame (The protocol data unit (PDU) for Layer 2 is the frame.)
What is the purpose of the core layer in the Cisco hierarchical network design model?
high-speed backbone switching (In the three layer hierarchy, the access layer provides host connectivity to the network. The distribution layer interconnects smaller networks, and the core layer provides high-speed connections at the top of the hierarchy.)
Which three elements do all communication methods have in common? (List three.)
message destination, message source, transmission medium
Which two layers of the OSI model specify protocols that are associated with Ethernet standards? (List two.)
physical layer data link layer
Which type of network model describes the functions that must be completed at a particular layer, but does not specify exactly how each protocol should work?
reference model (There are two common types of network communication models: Protocol model - This model closely matches the structure of a particular protocol suite and describes the functions that occur at each layer of protocols within the suite. The TCP/IP model is an example of a protocol model. Reference model - The primary purpose is to aid in a clearer understanding of the functions and processes necessary for network communications.This type of model does not specify exactly how a function should be accomplished. The OSI model is an example of a reference model.)
What role does a router play on a network?
selecting the path to destination networks (When a computer sends a packet onto the network, the packet includes a source and destination IP address. Routers use the destination IP address in a packet to forward the packet to the correct destination network.)
Which three layers of the OSI model make up the application layer of the TCP/IP model? (Choose three.)
session presentation application
Which term refers to the set of rules that define how a network operates?
standard (Standards ensure that different devices connecting to the network are able to communicate with each other. In networking there are many standards that define how the network should operate and that all components implement the same protocols.)
message source
the device that creates and sends the message on the network.
Structure of the Ethernet Frame preamble7,SFD1,DMAC6,SMAC6,Length / Type2, Encapulated Data46-1500, FCS 4
ya
