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