Term
| When we refer to a network's topology, what are we referring to? |
|
Definition
Either its physical or its logical topology. |
|
|
Term
| What is the rule of thumb to distinguish physical from logical topologies? |
|
Definition
| If you can see it and touch it, its physical; if you cannot see it or touch it, its logical. |
|
|
Term
| A network's topology affects its capabilities. What is the impact of choosing one topology over another? |
|
Definition
| Type of equipment the network needs; capabilities of the equipment; growth of the network; and way the network is managed. |
|
|
Term
| What are the advantages of a bus topology? |
|
Definition
| Bust networks are inexpensive to install, you can easily add more workstations, bus networks use less cable than other physical topologies, and the bus topology works well for small networks (2-10 devices). |
|
|
Term
| What are the disadvantages of a bus topology? |
|
Definition
| It's no longer a recommended option for new installations, if the backbone, if the backbone breaks, the network is down, only a limited number of devices can be included, it's difficult to isolate where a problem may be, and sharing the same cable means slower access time. |
|
|
Term
| What are the advantages of a star topology? |
|
Definition
It's easy to add more devices as your network expands, the failure of one cable or one cable break will not bring down the entire network, the hub provides centralized management, it's easy to find device and cable problems, a star network can be upgraded to faster network transmission speeds, and it's the most common toplogy, so many equipment options are available. |
|
|
Term
| What are the disadvantages of a star topology? |
|
Definition
| A star network requires more media than a ring or bus network, the failure of the central hub can bring down the entire network, and the costs of installation and equipment are higher than for most bus networks. |
|
|
Term
| What are the advantages of a ring topology? |
|
Definition
| Data packets can travel at greater speeds, there are no collisions, and it is easier to locate problems with devices and cable, and no terminators are needed. |
|
|
Term
| What are the disadvantages of a ring topology? |
|
Definition
| A ring network requires more cable than a bus network, a break in the cable may bring many types of ring networks down, when you add devices to the ring, all devices are suspended from using the network, and it's not as common as the bus topology, so there's not as much equipment available. |
|
|
Term
| What are the two most common hybrid topologies? |
|
Definition
(1) Star-bus. (2) Star-ring topologies. |
|
|
Term
| What are the advantages of a logical bus topology? |
|
Definition
| If a node is down, it does not bring down the entire network, it's the most widely implemented of the logical topologies, and additions and changes can be made easily without affecting other workstations. |
|
|
Term
| What are the disadvantages of a logical bus topology? |
|
Definition
Collisions can occur easily, and only one device may access the media at a time. |
|
|
Term
| What are the advantages of a logical ring topology? |
|
Definition
| The amount of data that can be carried in one message is much greater that on a logical bus, and there are no collisions. |
|
|
Term
| What are the disadvantages of a logical ring topology? |
|
Definition
| A broken ring will stop all transmissions, and a device must wait for any empty token to be able to transmit. |
|
|
Term
| The asynchronous data communications protocol data frames use what for synchronization? |
|
Definition
|
|
Term
| What three elements of the message block (frame) format can be contained in each BSC transmission? |
|
Definition
(1) A header. (2) The text. (3) A trailer. |
|
|
Term
| All BOP transmissions in a link follow the frame format the frame consists of what what fields? |
|
Definition
| Flag Field, Station Address Field, Control Field, Data Information Field, Frame check sequence, and Closing Flag Field. |
|
|
Term
| The easiest way to break down the many protocols of the TCP/IP suite is according to where they operate within the OSI model. Each protocol in this stack operates at what four layers? |
|
Definition
(1) The Data Link Layer. (2) The Network layer (also known as the Internet layer in the TCP/IP model). (3) The Transport layer. (4) The Application layer. |
|
|
Term
| The protocols at the Data Link Layer define the access method for the media, the architecture, and interface with the Physical layer of the network. What standards are these protocols base on? |
|
Definition
| The standards that have been adopted by the IEEE as the Project 802 standards. |
|
|
Term
| What are the four most important TCP/IP protocols that function within the network layer? |
|
Definition
(1) IP. (2) ARP. (3) RARP. (4) ICMP. |
|
|
Term
| Within the IP, what are the IP datagram fields? |
|
Definition
| Version, IHL, DiffServ Field, Total length, Identification, Flags, Fragment offset, TTL, Protocol, Header checksum, Source IP address, Options, Padding, and Data. |
|
|
Term
| What are the fields belonging to a TCP segment? |
|
Definition
| Source port, Destination port, Sequence number, ACK, TCP header length, Reserved, Flags, Sliding-window size (or window), Checksum, Urgent pointer, Options, Padding and Data. |
|
|
Term
| What are some reasons for implementing DHCP? |
|
Definition
| To reduce the time and planning spend on IP address management, to reduce the potential for errors in assigning IP addresses, to enable users to move their workstations and printers without having to change their P/IP configuration, and to make IP addressing transparent for mobile users. |
|
|
Term
What network is an informal collection of government, military, commercial, and educational computer netowrks all interconnected and transmitting information? |
|
Definition
|
|
Term
| A LAN may serve how many users? |
|
Definition
| A LAN may serve as few as two or three users or as many as thousands of users. |
|
|
Term
| What type of network is also used as a means to interconnect several local area networks by bridging them with backbone lines? |
|
Definition
| A MAN or champus network. |
|
|
Term
| What network provides a private tunnel through the internet? |
|
Definition
|
|
Term
| What are the advantages of using a peer-to-peer network? |
|
Definition
(1) They're easy to configure. (2) They don't require additional server hardware and software. (3) Users can manage their own resources. (4) The don't require a network administrator. (5) The reduce cost. |
|
|
Term
| What are the disadvantages of client/server networks? |
|
Definition
| The disadvantages of client/server networks include: Planning, design, and management are complicated, Managing servers requires dedicated staff, and Server hardware and software are expensive. |
|
|
Term
| What IP address scheme is a 32-bit number usually represented as a four-part decimal number with each of the four parts separated by a period or decimal point? |
|
Definition
|
|
Term
| IP addresses with a first octet from 192 to 223 are part of what IPv4 class? |
|
Definition
|
|
Term
| What IP address scheme is a 128-bit addressing scheme and uses eight sets of four hexadecimal digits? |
|
Definition
|
|
Term
| What two questions must you ask yourself during the selection of a subnet mask? |
|
Definition
(1) How many routed subnets are required on the network? (2) What is the likely maximum number of hosts on any one of those subnets. |
|
|
Term
| What type of routing protocols supports VLSM? |
|
Definition
| Classless routing protocols. |
|
|
Term
| What are some examples of classless routing protocols? |
|
Definition
(1) OSPF. (2) RIP version 2. (3) Cisco's EIGRP. (4) BGP. (5) IS-IS. |
|
|
