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39 Cards in this Set

  • Front
  • Back
What is the Transport Layer responsible for?
Segmentation (Breaking messages into smaller pieces)
What is the Network Layer Responsible for?
Addressing and routing of the message.
What is the process of passing message segments down from the application layer to the data link layer on the sending end and passing them back up to the application layer on the receiving end?
What is the process of passing message segments down from the application layer to the data link layer on the sending end and passing them back up to the application layer on the receiving end?
What are the 4 commonly used protocol suites?
For the TCP/IP protocol, what function does TCP perform?
Packetization (segmentation) - breaking the messages into smaller pieces, numbering the segments, and reassembling at destination.
For TCP/IP, what function does IP perform?
IP is responsible for addressing and routing of data packets.
For TCP/IP, what are the two versions currently in use for IP?
For IPX/SPX, what function does IPX perform?
IPX performs the addressing and routing functions.
For IPX/SPX, what function does SPX perform?
Packetization, packet numbering, ensuring reliable delivery and assembly.
What does SNA stand for?
Systems Network Architecture
How does the application layer see a message?
As a single block or stream of data.
What form of routing sends all packets on a virtual circuit through the same route from source to destination?
Connection-Oriented Routing
What is the first step in creating a virtual circuit?
Sending a special SYN packet, which requests the virtual circuit and negotiates with the receiver over what packet size to use.
Which routing technique uses the continuous ARQ technique?
Connection-Oriented Routing
What is the packet called that is sent by TCP to close a virtual circuit?
FIN packet
Which routing technique sends packets individually without using a virtual circuit?
Connectionless Routing
What protocol is used for connectionless routing?
User Datagram Protocol (UDP)
What do you call the timely delivery of packets?
Quality of Service (QoS) - defines classes of service, each with a different priority.
What is the high-speed data link layer protocol that includes QoS?
Asynchronous Transfer Mode (ATM)
What are the three kinds of address used by the internet?
1. Application layer addresses (
2. Network layer addresses ( (IP)
3. Data link layer addresses (00-0C-00-F5-03-5A) (MAC)
What do you call the process of translating one type of address to another?
Address Resoloution
Who manages the assignment of IP and application layer names?
ICANN (Internet Corporation for Assigned Names and Numbers)
What do you call a group of IP numbers with the same prefix used on a LAN?
What separates the subnet part of the address from the host part?
Subnet Mask
What do you call the process of giving addresses to clients only when they are logged into a network?
Dynamic Addressing
What are the two programs used for dynamic addressing?
DHCP (Dynamic Host Control Protocol)
What is a Domain Name Service (DNS)?
A system that works through a group of name servers that maintain databases which contain directories of domain names and their corresponding IP addresses.
What do you call the process of climbing the DNS hierarchy to establish an IP address?
Recursive DNS Resolution
What do you use when a data link layer destination address is unknown?
Address Resolution Protocol (ARP)
Routing decisions made by one central computer is called?
Centralized Routing
Decentralized routing is when computers making routing decisions operate independently of one another. What are the 2 types of decentralized routing?
1. Static Routing - uses fixed routing tables
2. Dynamic Routing - routing decisions are made dynamically, based on condition information exchanged between devices
What are the two Dynamic Routing Algorithms?
1. Distance Vector
2. Link State
How does a Distance Vector routing algorithm work?
Uses the least number of hops to decide how to route a packet
How does Link State routing algorithm work?
Uses a variety of information types and takes into account such factors as congestion and response time to decide how to route a packet.
Routing protocols can be either exterior or interior. What is the exterior routing protocol used on the internet?
Border Gateway Protocol (BGP)
Routing protocols can be either exterior or interior. What are the 3 interior routing protocols?
1. Routing Information Protocol (RIP) - (Distance Vector)
2. Open Shortest Path First (OSPF) - (Link State)
3. Enhanced Interior Gateway Routing Protocol (EIGRP) - (Link State)
What 4 kinds of network layer addressing information is necessary before a TCP/IP computer can work?
1. The computer's own IP address
2. It's subnet mask - to determine what addresses are part of its subnet
3. The local DNS server's IP address - so it can translate application layer addresses into IP addresses
4. The IP address of the router on its subnet - so it knows where to route the messages going outside of its subnet
What are the 3 possible cases of HTTP requests?
1. A known address, same subnet
2. A known address, different subnet
3. an unknown address