CISCO CCENT ICND 100-105
The linear processing and modular nature of the OSI networking model provides what benefits to the learner?
Easier troubleshooting and Faster understanding of new technology
TCP traffic types
HTTP, FTP and Telnet
TCP 3-way handshake
Sender sends a SYN, Receiver sends a SYNACK, Sender sends an ACK
What are characteristics that are specific to UDP?
Stands for User Datagram Protocol, Packets are treated independently, Packet delivery is not guaranteed
How many connections are needed to connect 6 devices in a mesh topology assuming only a single connection between any two devices?15
15
What layers prepare the data for destination?
Application, Presentation, Session
Bits - Frame - Packet - Segment. What TCP/IP layers are the associated with?
Bits=Physical, Frame=Data Link, Packet=Internet, Segment=Transport
Media Pathways
Bounded (Cabling-- Copper, Fiber) Unbounded (wireless, RF)
UDP traffic types
DNS, DHCP and VOIP
Advantages of using Open rather than proprietary Networking Standards?
Different vendor products can be added to a network and Vendor specialization on certain aspect of networking
What is the defacto standard model used in networking today?
TCP/IP Model
At what layer do the TCP and UDP protocols work within the TCP model?
Transport layer
Which layer of the TCP/IP model provides communication services directly to the application processes running on a host?
Transport layer
What layers prepare the data for Network delivery?
Transport, Network, Data Link and Physical
Data Encapsulation / Decapsulation
sending data where the data is augmented with successive layers of control information before transmission across a network, then the removal of layers when received. Encapsulation is layer 7 to 1. Decapsulation is layer 1 to 7.
SYN-ACK (synchronization-acknowledgment)
the message an initiating device sends in the TCP connection setup. other control flags... URG (urgent), ACK, PSH (push), RST (reset), Syn (sync) and FIN
PDU
(Protocol Data Unit) A unit of data at any layer of the OSI Model.
Physical Layer
L1, Media Pathways (cabling, WLS, RF)... Cables, Connections, Lights and Hubs... Bits
Data Link Layer
L2, Forwarding to the next device... MAC addressing... Ethernet, Frame Relay, PPP, HDLC... NIC cards, L2 Switches... Frame
Network Layer
L3, IP Addressing... IP, IPX... Routers... Packet
Transport Layer
L4, Segmentation, End to End Connecting... TCP, UDP, SPX... Firewalls, Host Computers... Segment
Session Layer
L5, Synchronization, Logical Ports, Dialog Control, Interhost communications... NFS, RPC, SQL, NetBios... Logical Ports
Presentation Layer
L6, Formatting, Encryption, Data Representation... .jpg, ASCII, .gifs, .tiffs...
Application Layer
L7, Creates and opens the Data... HTTP, HTTPS, SMTP... User apps
OSI Layers
Open System Interconnection 1. Physical 2. Data Link 3. Network 4. Transport 5. Session 6. Presentation 7. Application
