3Dx5X Core Cdcs V2U1

Front 1

Into what two categories can you divide the OSI model?

Back 1

Application (upper) and data transport (lower) layers.

Front 2

What is the responsibility of the Data Transport layers of the OSI model?

Back 2

Defining how data is sent across the physical media, through Internetwork devices, to the destination computer, and to the application on the destination machine.

Front 3

What is physical topology?

Back 3

It is a “map,” or description, of the layout of the network media that interconnects the devices on a network.

Front 4

What is logical topology?

Back 4

It defines the way in which devices communicate and data is transmitted throughout the network.

Front 5

What is the rule of thumb to distinguish physical from logical topologies?

Back 5

If you can see it and touch it, it is physical; if you cannot see it or touch it, it is logical.

Front 6

A topology affects the network's capabilities; what is the impact of choosing one topology over another?

Back 6

Type of equipment the network needs; capabilities of the equipment; growth of the network; and way the network is managed.

Front 7

What are the advantages of a bus topology?

Back 7

Inexpensive to install; easy to add more workstations; requires less cable than other; works well for small networks (2-10 devices).

Front 8

What are the disadvantages of a bus topology?

Back 8

It’s no longer a recommended option for new installations; 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.

Front 9

What are the advantages of a star topology?

Back 9

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 topology, so many equipment options are available.

Front 10

What are the disadvantages of a star topology?

Back 10

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.

Front 11

What are the advantages of a ring topology?

Back 11

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.

Front 12

What are the disadvantages of ring topology?

Back 12

A ring network requires more cable than a bus network; a break in the cable will 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.

Front 13

What are the two most common hybrid topologies?

Back 13

Star-bus and star-ring topologies.

Front 14

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?

Back 14

The Data Link layer, the Network layer (also known as the Internet layer in the TCP/IP model), the Transport layer, or the Application layer.

Front 15

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 based on?

Back 15

The standards that have been adopted by the IEEE as the Project 802 standards.

Front 16

What are the four most important TCP/IP protocols that function within the network layer?

Back 16

Internet Protocol (IP), Address Resolution Protocol (ARP), Reverse Address Resolution Protocol (RARP), and Internet Control Message Protocol (ICMP).

Front 17

What are the fields belonging to a TCP segment?

Back 17

Source port, Destination port, Sequence number, Acknowledgment number (ACK), TCP header length, Reserved, Flags, Sliding-window size (or window), Checksum, Urgent pointer, Options, Padding, and Data.

Front 18

What are some reasons for implementing DHCP?

Back 18

To reduce time spent on IP address management, to reduce the potential for errors in assigning IP addresses, and to make IP addressing transparent for mobile users.

Front 19

What is a group of computers and devices that share a common communication line and resources in a small geographical area?

Back 19

LAN

Front 20

A local area network may serve how many users?

Back 20

As few as 2-3 or as many as thousands of users.

Front 21

What type of network is also used as a means to interconnect several LANs by bridging them with backbone lines?

Back 21

Metropolitan Area Network or campus network

Front 22

What network provides a private tunnel through the internet?

Back 22

VPN

Front 23

What is the port used when you do credit card transactions with e-commerce sites?

Back 23

SSL - port 443

Front 24

What are the two main parts of an IPv4 address?

Back 24

Network and host number

Front 25

Who assigns network numbers?

Back 25

IANA, ISP, or OSP

Front 26

Convert 11000000 10101000 01111011 01100100 to dotted decimal notation.

Back 26

192.168.123.100

Front 27

What is the reserved IPv4 address for loop back?

Back 27

127.0.0.1

Front 28

What is the reserved IPv4 address for a limited broadcast?

Back 28

255.255.255.255

Front 29

What is a subnet mask?

Back 29

It is a mechanism that allows a network device to divide an IP address into a network and host number.

Front 30

What are two methods of subnet masking?

Back 30

Classful and classless.

Front 31

What is the difference between the two methods of subnet masking?

Back 31

Classful subnet masking is using the default mask to separate the network number, given by IANA, from the host number. Classless subnet masking borrows bits from the host field, extending beyond the default mask assigned by IANA, and creating a subnet field.

Front 32

What are some benefits to subnetting?

Back 32

Ease of administration, improve network performance and security.

Front 33

How long is an IPv6 address?

Back 33

128 bits or 16 octets long

Front 34

How is an IPv6 address expressed?

Back 34

16 byte field, in colon hexadecimal format.

Front 35

What are two ways to shorten the expression of an IPv6 address?

Back 35

Leading zero compression and zero compression.

Front 36

What is a unicast address?

Back 36

Address identity to a single interface.

Front 37

What is a multicast address?

Back 37

An address used to identify a group of interfaces belonging to different nodes starting with an address of FF00::/8.

Front 38

What is an anycast address?

Back 38

An address used to identify a set of interfaces; but the packets are sent and accepted by the interface that is closest.

Front 39

What are the three types of unicast address?

Back 39

Link, site, and global.

Front 40

What is an IPv6 loop back address?

Back 40

0:0:0:0:0:0:0:1 or ::1.

Front 41

What are some tools available to transition from IPv4 to IPv6?

Back 41

Dual IP layer / Dual Stack, Configured tunneling of IPv6 over IPv4, IPv4-compatible IPv6 addresses, and automatic tunneling of IPv6 over IPv4.

Front 42

(201) What layer of the Open System Interconnect model defines the electrical, mechanical, procedural, and functional specifications for links between communicating network systems?

Back 42

A. Physical.
b. Data Link.
c. Network.
d. Transport.

Front 43

(201) The Institute of Electrical and Electronics Engineers divide the Open System Interconnect Data Link Layers into what two sublayers?

Back 43

a. High Level Data Link Control and Synchronous Data Link Control.
B. Logical Link Control and Media Access Control.
c. Distance Vector and Link State.
d. RS–232 and RS–530.

Front 44

(201) At what Open System Interconnect layer do network switches and bridges operate?

Back 44

a. Network.
b. Physical.
C. Data Link.
d. Transport.

Front 45

(201) At what Open System Interconnect layer do routers operate?

Back 45

A. Network.
b. Physical.
c. Data Link.
d. Transport.

Front 46

(201) At what Open System Interconnect layer are common data compression and encryption
schemes used?

Back 46

a. Application.
b. Session.
C. Presentation.
d. Transport.

Front 47

(201) What Open System Interconnect layer is closest to the end user?

Back 47

A. Application.
b. Session.
c. Presentation.
d. Transport.

Front 48

(201) What is a formal set of rules and conventions that govern how computers exchange information over a network medium?

Back 48

a. Specification.
b. Standard.
c. Etiquette.
D. Protocol.

Front 49

(202) What topology defines the layout of a network’s devices and media?

Back 49

A. Physical.
b. Logical.
c. Star.
d. Hybrid.

Front 50

(202) What topology defines the way in which devices communicate, and data is transmitted, throughout the network?

Back 50

a. Physical.
B. Logical.
c. Star.
d. Hybrid.

Front 51

(202) What topology consists of devices connected to a common, shared cable?

Back 51

A. Bus.
b. Ring.
c. Star.
d. Hybrid.

Front 52

(202) What topology consists of cable segments from each computer connected to a centralized component?

Back 52

a. Bus.
b. Ring.
C. Star.
d. Hybrid.

Front 53

(202) What topology combines two or more different physical topologies in a single network?

Back 53

a. Bus.
b. Ring.
c. Star.
D. Hybrid.

Front 54

(203) Which network protocol has the Department of Defense chosen as its standard to govern the flow of information?

Back 54

a. AppleTalk.
b. NetBios Extended User Interface.
C. Transport Control Protocol/Internet Protocol.
d. Internetwork Packet Exchange/ Sequenced Packet Exchange.

Front 55

(203) What Transmission Control Protocol/Internet Protocol network layer protocol provides the service of matching a known IP address for a destination device to a Media Access Control address?

Back 55

a. Internet Protocol.
B. Address Resolution Protocol.
c. Reverse Address Resolution Protocol.
d. Internet Control Message Protocol.

Front 56

(203) What Transmission Control Protocol/Internet Protocol network layer protocol provides the IP address for a device that knows its own MAC address?

Back 56

a. Internet Protocol.
b. Address Resolution Protocol.
C. Reverse Address Resolution Protocol.
d. Internet Control Message Protocol.

Front 57

(203) What Transmission Control Protocol/Internet Protocol network layer protocol provides messaging that can help with troubleshooting?

Back 57

a. Internet Protocol.
b. Address Resolution Protocol.
c. Reverse Address Resolution Protocol.
D. Internet Control Message Protocol.

Front 58

(203) What Transmission Control Protocol/Internet Protocol transport layer protocol provides reliable data delivery services?

Back 58

a. Internet Protocol.
b. User Datagram Protocol.
C. Transmission Control Protocol.
d. Internet Control Message Protocol.

Front 59

(203) What application within Transmission Control Protocol/Internet Protocol is used to send and receive files via TCP?

Back 59

A. File Transfer Protocol.
b. Trivial File Transfer Protocol.
c. Simple Mail Transfer Protocol.
d. HyperText Transfer Protocol.

Front 60

(204) What type of network connects networks that are typically separated by geographical distances between cities, states, countries, or around the world?

Back 60

a. Local Area Network.
B. Wide Area Network.
c. Virtual Private Network.
d. Metropolitan Area Network.

Front 61

(204) What type of network makes use of tunneling and security protocols to enables a group of two or more computer systems to communicate over the public Internet?

Back 61

a. Local Area Network.
b. Wide Area Network.
C. Virtual Private Network.
d. Metropolitan Area Network.

Front 62

(204) Which is a common port that contains Hyper Text Transfer Protocol servers and proxies?

Back 62

A. Port 80.
b. Port 110.
c. Port 443.
d. Port 8080.

Front 63

(205) How many bits are in an IPv4 address?

Back 63

a. 16 bits.
B. 32 bits.
c. 64 bits.
d. 128 bits.

Front 64

(205) Instead of using binary, how are IPv4 addresses expressed to be more user-friendly?

Back 64

a. Colon Hexadecimal Format.
C. Dotted Decimal Notation.
c. Hexadecimal.
d. Octal.

Front 65

(205) Using a range of 1–126 in the first octet of an IPv4 address, what class does it belong to?

Back 65

A. Class A.
b. Class B.
c. Class C.
d. Class D.

Front 66

(205) What IPv4 class address is used for networks with about 250 nodes?

Back 66

C. Class C.
b. Class D.
c. Class E.
d. Class F.

Front 67

(205) What IPv4 class address is used for multicast addressing?

Back 67

a. Class C.
B. Class D.
c. Class E.
d. Class F.

Front 68

(205) What IPv4 reserved address is used for loop back?

Back 68

a. 0.0.0.0.
B. 127.0.0.1.
c. 207.55.157.255.
d. 255.255.255.255.

Front 69

(205) What is a mechanism that allows a network device to divide an IP address into a network
and host number?

Back 69

A. Subnet mask.
b. Broadcast.
c. Multicast.
d. Subnet.

Front 70

(205) What is the default classful subnet mask on class B networks?

Back 70

A. 255.255.0.0.
b. 255.255.240.0.
c. 255.255.255.0.
d. 255.255.255.224.

Front 71

(205) What method borrows bits from the host field of an IP address to create a subnet?

Back 71

a. Classful Subnet Masking.
B. Classless Inter-Domain Routing.
c. Virtual Private Networking.
d. Virtual Local Area Networking.

Front 72

(206) Instead of using binary, how are IPv6 addresses expressed to be more user-friendly?

Back 72

A. Colon Hexadecimal Format.
b. Dotted Decimal Notation.
c. Hexadecimal.
d. Octal.

Front 73

(206) What notation is expressed in leading zero compression for IPv6?

Back 73

A. 1234:1234:0:0:1234:0:0:1234.
b. 10AB::3:0:1234:5678.
c. 255.255.255.255.
d. 127.0.0.1.

Front 74

(206) What notation is expressed in zero compression for IPv6?

Back 74

a. 1234:1234:0:0:1234:0:0:1234.
B. 10AB::3:0:1234:5678.
c. 255.255.255.255.
d. 127.0.0.1.

Front 75

(206) What Unicast address scope operates within a network segment, and will not originate from, or be destined to, an interface that requires a router to direct traffic?

Back 75

a. Site-local.
B. Link-local.
c. Aggregatable Local.
d. Aggregatable Global.

Front 76

(206) What Unicast address scope is designed to be private, internally routable addresses that do not route outside the site?

Back 76

A. Site-local.
b. Link-local.
c. Aggregatable Local.
d. Aggregatable Global.

Front 77

(206) What Unicast address scope is publicly accessible with the Network ID portion of the address broken up into different areas allowing for hierarchical design and allocation?

Back 77

a. Site-local.
b. Link-local.
c. Aggregatable Local.
D. Aggregatable Global.