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CCNA DEFINITIONS FOR ICND1
CCNA DEFINITIONS FOR ICND1
55
Computer Networking
Graduate
05/29/2014

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Term
ADJACENT-LAYER INTERACTION ON A SINGLE COMPUTER
Definition
HOW ON A SINGLE COMPUTER, TWO ADJACENT LAYERS IN A NETWORKING ARCHITECTURAL MODEL WORK TOGETHER, WITH THE LOWER LAYER PROVIDING SERVICES TO THE HIGHER LAYER.
Term
DE-ENCAPSULATION
Definition
ON ON COMPUTER THAT RECEIVES DATA OVER A NETWORK, THE PROCESS IN WHICH THE DEVICE INTERPRETS THE LOWER-LAYER HEADERS AND, WHEN FINISHED WITH EACH HEADER, REMOVES THE HEADER, REVEALING THE NEXT-HIGHER-LAYER PDU.
Term
ENCAPSULATION
Definition
THE PLACEMENT OF DATA FROM A HIGHER-LAYER PROTOCOL BEHIND THE HEADER OF THE NEXT LOWER LAYER PROTOCOL.  FOR EXAMPLE, AN IP PACKET COULD BE ENCAPSULATED IN AN ETHERNET HEADER AND TRAILER BEFORE BEING SENT OVER AN ETHERNET
Term
FRAME
Definition
A TERM REFERRING TO A DATA-LINK HEADER AND TRAILER, PLUS THE DATA ENCAPSULATED BETWEEN THE HEADER AND TRAILER.
Term
NETWORKING MODEL
Definition
GENERIC TERM REFERRING TO ANY SET OF PROTOCOLS AND STANDARDS COLLECTED INTO A COMPREHENSIVE GROUPING, THAT WHEN FOLLOWED BY THE DEVICES IN A NETWORK, ALLOWS ALL THE DEVICES TO COMMUNICATE.  E.G. TCP/IP AND OSI.
Term
PACKET
Definition
A LOGICAL GROUPING OF BYTES THAT INCLUDES THE NETWORK LAYER HEADER AND ENCAPSULATED DATA, BUT SPECIFICALLY DOES NOT INCLUDE ANY HEADERS AND TRAILERS BELOW THE NETWORK LAYER.
Term
PROTOCOL DATA UNIT (PDU)
Definition
REFERRING THE HEADER DEFINED BY SOME LAYER OF A NETWORKING MODEL, AND THE DATA ENCAPSULATED BY THE HEADER (POSSIBLY TRAILER) OF THAT LAYER, BUT SPECIFICALLY NOT INCLUDING ANY LOWER-LAYER HEADERS AND TRAILERS.
Term
SAME-LAYER INTERACTION  ON DIFFERENT COMPUTERS
Definition

The two computers use a protocol to communicate with the same layer on another computer. The protocol defined by each layer uses a header to communicate.

Term
SEGMENT
Definition
IN TCP, A TERM USED TO DESCRIBE A TCP HEADER AND ITS ENCAPSULATED DATA (ALSO CALLED AN L4PDU).  IT IS THE PROCESS OF ACCEPTING A LARGE CHUNK OF DATA FROM THE APPLICATION LAYER AND BREAKING IT INTO SMALLER PIECES THAT FIT INTO TCP SEGMENTS.  IN ETHERNET, A SEGMENT IS EITHER A SINGLE ETHERNET CABLE OR A SINGLE COLLISON DOMAIN (NO MATTER HOW MANY CABLES ARE USED.)
Term
ETHERNET
Definition
A SERIES OF LAN STANDARDS DEFINED BY IEEE, ORIGINALLY INVENTED BY XEROX CORPORATION AND DEVELOPED JOINTLY BY XEROX, INTEL, AND DIGITAL EQUIPMENT CORPORATION.
Term
IEEE
Definition
INSTITUTE OF ELECTICAL AND ELECTRONICS ENGINEERS.  A PROFESSIONAL ORG THAT DEVELOPS COMMUNICATIONS AND NETWORK STANDARDS, AMONG OTHER ACTIVITIES.
Term
WIRED LAN
Definition
ETHERNET LANs THAT USE CABLES FOR THE LINKS BETWEEN NODES, LIKE COPPER WIRES.
Term
WIRELESS LAN
Definition
A LAN THAT PHYSICALLY TRANSMITS BITS USING RADIO WAVES.  THE NAME WIRELESS COMPARES THESE LANS TO MORE TRADITIONAL WIRED LANS.
Term
ETHERNET FRAME
Definition
A TERM REFERRING TO AN ETHERNET DATA LINK HEADER AND TRAILER, PLUS THE DATA ENCAPSULATED BETWEEN BOTH.
Term
FAST ETHERNET
Definition
A COMMON NAME FOR ALL THE IEEE STANDARDS THAT SEND DATA AT 100 MEGABITS PER SECOND.
Term
GIBABIT ETHERNET
Definition
THE COMMON NAME FOR ALL THE IEEE STANDARDS THAT SEND DATA AT 1 GIGABIT PER SECOND.
Term
NETWORK INTERFACE CARD (NIC)
Definition
A COMPUTER CARD OR EXPANSION CARD AND SOMETIMES INTERGRATED INTO THE MOTHERBOARD AND MOST HAVE RJ-45 ETHERNET PORTS.
Term
SEGMENTATION
Definition
PROCESS OF BREAKING A LARGE PIECE OF DATA FROM AN APPLICATION INTO PIECES APPROPRIATE IN SIZE TO BE SENT THROUGH THE NETWORK
Term
SECURE SHELL (SSH)
Definition
A TCP/IP APPLICATION LAYER PROTOCOL THAT SUPPORT TERMINAL EMULATION BETWEEN A CLIENT AND SERVER, USING DYNAMIC KEY EXCHANGE AND ENCRYPTION TO KEEP COMMUNICTIONS PRIVATE.
Term
SHORTEST PATH FIRST (SPF) ALGORITHM
Definition
THE NAME OF THE ALGORITHM USED BY LINK-STATE ROUTING PROTOCOLS TO ANALYZE THE LSDB AND FIND THE LEAST-COST ROUTES FROM THAT ROUTER TO EACH SUBNET.
Term
SPANNING TREE PROTOCOL (STP)
Definition
A PROTOCOL THAT ALLOWS A SWITCH TO DYNAMICALLY WORK AROUND LOOPS IN A NETWORK TOPOLOGY BY CREATING A SPANNING TREE.  SWITCHES EXCHANGE BRIDGE PROTOCOL DATA UNIT (BPDU) MESSAGES WITH OTHER SWITCHES TO DETECT LOOPS AND THEN REMOVE THE LOOPS BY BLOCKING SELECTED SWITCH INTERFACES.
Term
STRAIGHT THROUGH CABLE
Definition
A ETHERNET CABLE THAT CONNECTS THE WIRE ON PIN 1 AND ON ONE END OF THE CABLE TO PIN 1 ON THE OTHER END OF THE CABLE, PIN 2 TO PIN 2, AND SO ON.
Term
WHAT IS THE CIDR PREFIX?
Definition

The CIDR Prefix is specified with the forward slash character followed by the network prefix size expressed as a decimal number. This number specifies the number of leading bits that are part of the network prefix in this IP address.

 

Term
FRAME CHECK SEQUENCE
Definition
4 BYTES ON THE END OF A ETHERNET FRAME THAT PROVIDES A METHOD FOR THE RECEIVING NIC TO DETERMINE WHETHER THE FRAME EXPERIENCED TRANSMISSION ERRORS.
Term
WHAT ARE THE PARTS OF THE IEEE 802.3 ETHERNET HEADER AND TRAILER FIELDS?
Definition
  1. PREAMBLE
  2. START FRAME DELIMETER (SFD)
  3. DESTINATION MAC ADDRESS
  4. SOURCE MAC ADDRESS
  5. TYPE
  6. DATA AND PAD
  7. FRAME CHECK SEQUENCE
Term
MAXIMUM TRANSMISSION UNIT (MTU)
Definition
DEFINES THE MAX LAYER 3 PACKET THAT CAN SENT OVER A MEDIUM.  BECAUSE LAYER 3 PACKET REST INSIDE THE DATA PORTION OF AN ETHERNET FRAME, 1500 BYTES IS THE LARGEST MTU ALLOWED OVER AN ETHERNET.
Term
ETHERNET ADDRESSES ARE ALSO CALLED WHAT?
Definition
MEDIA ACCESS CONTROL (MAC) ADDRESSES.
Term
IEEE CALLS THE UNIVERSAL MAC ADDRESS WHAT?
Definition
GLOBAL MAC ADDRESS
Term
WHAT IS THE CIDR PREFIX? (e.g. /27)
Definition

 

THE CIDR PREFIX IS SPECIFIED WITH THE FORWARD SLASH CHARACTER FOLLOWED BY THE NETWORK PREFIX SIZE EXPRESSED AS A DECIMAL NUMBER.  THIS NUMBER SPECIFIES THE NUMBER OF LEADING BITS THAT ARE PART OF THE NETWORK PREFIX IN THIS IP ADDRESS.

Term
LEASED LINE
Definition
Term
WIDE-AREA NETWORK (WAN)
Definition
Term
TELCO
Definition
Term
SERIAL INTERFACE
Definition
Term
HDLC
Definition
Term
ETHERNET OVER MPLS
Definition
Term
DEFAULT ROUTER (DEFAULT GATEWAY)
Definition
Term
ROUTING TABLE
Definition
Term
IP NETWORK
Definition
Term
IP SUBNET
Definition
Term
IP PACKET
Definition
Term
DOTTED-DECIMAL NOTATION (DDN)
Definition
Term
UNICAST ADDRESS
Definition
Term
SUBNETTING
Definition
Term
DNS
Definition
Term
PING
Definition
Term
CONNECTION ESTABLISHMENT
Definition
Term
ERROR DETECTION
Definition
Term
ERROR RECOVERY
Definition
Term
FLOW CONTROL
Definition
Term
PORT
Definition
Term
WEB SERVER
Definition
Term
WHAT IS A SUBNET MASK?
Definition
IS ANOTHER COMMON NOTATION USED TO SPECIFY THE NUMBER OF BITS IN THE NETWORK PREFIX OF AN IP ADDRESS.  A 32 BIT BINARY VALUE.  BOTH CIDR PREFIX AND SUBNET MASK CONVEY THE SAME INFORMATION.
Term
DEFINE THE NETWORK PREFIX VERSUS THE HOST IDENTIFIER?
Definition

The Network Prefix identifies the network and the host identifier identifies a unique host within that network. This is similar to how a subscriber portion of a telephone number uniquely identifies a particular subscriber within an area code.

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