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WGU C246 Chapters 1-7
Terms in this set (69)
The process of TCP on one computer marking a TCP segment as segment 1, and the receiving computer then acknowledging the receipt of TCP segment 1 is an example of what?
the process of HTTP asking TCP to send some data and making sure that it is received correctly is an example of what?
the process of putting headers (and sometimes trailers) around some data
Provides an interface from the application to the network by supplying a protocol with actions meaningful to the application, for example, "get web page object.
This layer negotiates data formats, such as ASCII text, or image types like JPEG.
This layer provides methods to group multiple bidirectional messages into a workflow for easier management and easier backout of work that happened if the entire workflow fails.
In function, much like TCP/IP's transport layer. This layer focuses on data delivery between the two endpoint hosts (for example, error recovery).
Like the TCP/IP network (Internet) layer, this layer defines logical addressing, routing (forwarding), and the routing protocols used to learn routes.
Data Link Layer
Defines the protocols for delivering data over a particular single type of physical network (for example, the Ethernet data link protocols).
This layer defines the physical characteristics of the transmission medium, including connectors, pins, use of pins, electrical currents, encoding, light modulation, and so on.
protocol data unit (PDU)
represents the bits that include the headers and trailers for that layer, as well as the encapsulated data
All Ethernet standards that come from the IEEE include the number?
an Ethernet data link header and trailer, plus the data encapsulated between the header and trailer.
the transmitting node changes the electrical signal over time, while the other node, the receiver, using the same rules, interprets those changes as either 0s or 1s
cable works correctly when the nodes use opposite pairs for transmitting data
If the endpoints transmit on different pin pairs
when two like devices connect to an Ethernet link, they both transmit on the same pins.
If the endpoints transmit on the same pin pair
1 and 2
What pins do PC NICs, Routers, and WAPs transmit on? (connecting to another router would require a cross-over cable)
3 and 6
What pins do Hubs and Switches transmit on? (connecting to another router would require a straight-through cable)
Media Access Control (MAC) Address (or Ethernet Address)
A 48-bit (6-byte) binary number, usually written as a 12-digit hexadecimal number, used to identify Ethernet nodes in an Ethernet network
Frames sent to this address should be delivered to all devices on the Ethernet LAN. It has a value of FFFF.FFFF.FFFF.
frames sent to this type of address will be copied and forwarded to a subset of the devices on the LAN that volunteers to receive frames
High-Level Data Link Control (HDLC)
A bit-oriented synchronous data link layer protocol developed by the International Organization for Standardization (ISO).
Ethernet over MPLS
A term referring specifically to how a service provider can create an Ethernet WAN service using an MPLS network. More generally, a term referring to Ethernet WAN services.
Point of Presence (PoP)
The physical installation uses a model in which each router uses a physical Ethernet link to connect to some SP device in an SP facility called a?
In the cabling for a leased line, which of the following typically connects to a four-wire line provided by a telco?
The list which the router checks the packet's "destination" address against to determine where to send the packet
This is manages by the routing protocol, which fills it, clears ones that are invalid, and prevents routing loops
Domain Name System (DNS)
method used by TCP to find IP address based on hostname
Address Resolution Protocol (ARP)
the method by which any host or router on a LAN can dynamically learn the MAC address of another IP host or router on the same LAN
Error recovery (reliability) is part of what layer?
Connection establishment and termination is part of what layer?
Ordered data transfer and data segmentation is part of what layer?
Function that allows receiving hosts to choose the correct application for which the data is destined, based on the port number
TCP segment (or Layer 4 PDU, or L4PDU)
The message created by TCP that begins with the TCP header, followed by any application data
socket (e.g. 10.1.1.2, TCP, port 80)
contains An IP address, A transport protocol and A port number
Simple Network Management Protocol (SNMP)
application layer protocol used specifically for network device management and used to query network devices
TCP connection establishment
the process of initializing Sequence and Acknowledgment fields and agreeing on the port numbers used.
SYN, SYN ACK, ACK
order of the three-way handshake between sockets
A protocol that requires an exchange of messages before data transfer begins, or that has a required pre-established correlation between two endpoints.
A protocol that does not require an exchange of messages and that does not require a pre-established correlation between two endpoints.
A process used by protocols that do error recovery, in which the number that acknowledges data lists the next data that should be sent, not the last data that was successfully received.
For protocols such as TCP that allow the receiving device to dictate the amount of data the sender can send before receiving an acknowledgment
In the URI http://www.certskills.com/ICND1, which part identifies the web server?
Internetwork Operating System (IOS)
operating system used by Cisco switches
No parity bits
1 stop bit
EXEC mode (or user mode)
generally just to look at the current status, but not to change any operational settings.
A part of the Cisco IOS CLI in which the user can use the most powerful and potentially disruptive commands on a router or switch
command lists the currently known facts about the switch's operational status
command also tells the user details about the operation of the switch. acts more like a live video camera feed.
mode in which the user can type configuration commands that are then added to the device's currently used configuration file
interface FastEthernet 0/1
could enter interface configuration mode by entering what configuration command?
command to move from enable mode to global configuration mode
global configuration command to configure the switch's name
line console 0
Movement from global configuration mode to console line configuration mode
Setting the console's simple password to hope
Setting the speed to 100 Mbps for interface Fa0/1
Movement from interface configuration mode back to global configuration mode
if the prompt shows "hostname(config)#", what configuration mode are you in?
if the prompt shows "hostname(config-line)#" what configuration mode are you in?
what is the prompt that shows in the interface configuration mode?
what is the prompt shown for a configuration mode accessed via the "vlan 1025" command?
file stored in NVRAM that stores the initial configuration used anytime the switch reloads Cisco IOS.
file that stores the currently used configuration commands. This file changes dynamically when someone enters commands in configuration mode. Stored in RAM memory.
copy running-config startup-config
backs up the running-config to the startup-config file. This command overwrites the current startup-config file with what is currently in the running-configuration file.
show mac address-table dynamic
view switch MAC address table, dynamic entries only
erase the startup-config file
remove VLAN configuration details
show interfaces f0/1 counters
lists statistics about incoming and outgoing frames on the f0/1 interface. In particular, it lists the number of unicast, multicast, and broadcast frames both the in and out direction, and a total byte count for those frames.
show mac address-table dynamic address 1111.2222.3333
show the mac address table entry for mac address 1111.2222.3333
show mac address-table dynamic vlan 1
show the mac address table for all mac addresses listed in VLAN 1
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