Comnet 2 Quiz

Question 1

is a contention-based media access method that allows all hosts on a
network to share the same link’s bandwidth

Answer 1

Ethernet

Question 2

uses both Data Link and Physical layer specifications, presented with
information relative to both layers, and need to effectively implement,
troubleshoot, and maintain an Ethernet network.

Answer 2

Ethernet

Question 3

refers to a network scenario wherein one device sends a frame
out on a physical network segment forcing every other device on the same
segment to pay attention to it

Answer 3

Collision Domain

Question 4

refers to a group of devices on a specific
network segment that hear all the broadcasts sent out on that
specific network segment.

Answer 4

Broadcast Domain

Question 5

is usually a boundary delimited by physical
media like switches and routers, the term can also refer to a logical
division of a network segment, where all hosts can communicate via a
Data Link layer, hardware address broadcast.

Answer 5

Broadcast Domain

Question 6

helps
devices share the bandwidth evenly while preventing two devices from
transmitting simultaneously on the same network medium.

Answer 6

Carrier Sense Multiple access with collision detection (CSMA/CD)

Question 7

created to overcome the problem of the collisions that
occur when packets are transmitted from different nodes at the same time.

Answer 7

CSMA/CD

Question 8

When a collision occurs on an Ethernet LAN, the following happens:

Answer 8

1. A jam signal informs all devices that a collision occurred.
2. The collision invokes a random backoff algorithm.
3. Each device on the Ethernet segment stops transmitting for a short time until
   its backoff timer expires.
4. All hosts have equal priority to transmit after the timers have expired.

Question 9

defined in the original IEEE 802.3 Ethernet
specification, Cisco says Ethernet uses only one wire pair with a digital signal
running in both directions on the wire.

Answer 9

Half-Duplex Ethernet

Question 10

uses the CSMA/CD protocol I just discussed to help prevent
collisions and to permit retransmitting if one occurs.

Answer 10

Half Duplex

Question 11

The Six situations that you can full-duplex ethernet:

Answer 11

1. With a connection from a switch to a host
2. With a connection from a switch to a switch
3. With a connection from a host to a host
4. With a connection from a switch to a router
5. With a connection from a router to a router
6. With a connection from a router to a hos

Question 12

decides on the exchange capability, which
means it checks to see if it can run at 10, 100, or even 1000 Mbps. It
then checks to see if it can run full-duplex, and if it can’t, it will run half-
duplex.

Answer 12

Auto-detect mechanism

Question 13

Important points in Full-Duplex:

Answer 13

1. There are no collisions in full-duplex mode.
2. A dedicated switch port is required for each full-duplex node.
3. The host network card and the switch port must be capable of
   operating in full-duplex mode.
4. The default behavior of 10Base-T and 100Base-T hosts is 10 Mbps
   half-duplex if the autodetect mechanism fails, so it is always good
   practice to set the speed and duplex of each port on a switch if you
   can.

Question 14

responsible for Ethernet addressing,
commonly referred to as MAC or hardware addressing.

Answer 14

Ethernet at the Data Link layer

Question 15

responsible for framing packets received from the
Network layer and preparing them for transmission on the local
network through the Ethernet contention-based media access
method.

Answer 15

Ethernet

Question 16

• It uses the Media Access Control (MAC) address burned into each and
every Ethernet network interface card (NIC).

Answer 16

Ethernet Addressing

Question 17

is assigned by the IEEE to an
organization. It’s composed of 24 bits, or 3 bytes, and it in turn assigns
a globally administered address also made up of 24 bits, or 3 bytes,
that’s supposedly unique to each and every adapter an organization
manufactures.

Answer 17

Organizationally Unique Identifier(OUI)

Question 18

When it has a
value of _, we can assume that the address is the MAC address of a
device and that it may well appear in the source portion of the MAC
header.

Answer 18

0

Question 19

When it’s a _, we can assume that the address represents either a
broadcast or multicast address in Ethernet.

Answer 19

1

Question 20

sometimes called the G/L bit or
U/L bit, where U means universal.

Answer 20

Global/Local Bit

Question 21

The use to limit order 1 and 0

Answer 21

Binary

Question 22

group either 4 or 8 buts togethe

Answer 22

Nible and byte

Question 23

are placed in a value spot, starting at the right
and moving left, with each spot having double the value of the
previous spot.

Answer 23

Binary Numbers

Question 24

Which is a numbering system that uses the
first six letters of the alpha

Answer 24

Hex is short for Hexadecimal

Question 25

responsible for combining bits into bytes and bytes into frames. • MAC frame format it provides error detection from a cyclic redundancy check (CRC)

Answer 25

Data Link Layer

Question 26

Encapsulating a frame within a different type of frame is called

Answer 26

Tunneling

Question 27

An alternating 1,0 pattern provides a 5 MHz clock at the start of each packet, which allows the receiving devices to lock the incoming bit stream.

Answer 27

Preamble

Question 28

h The preamble is seven octets and the SFD is one octet (synch). The SFD is 10101011, where the last pair of 1s allows the receiver to come into the alternating 1,0 pattern somewhere in the middle and still sync up to detect the beginning of the data

Answer 28

Start Frame Delimiter (SFD)SYNCH

Question 29

This transmits a 48-bit value using the least significant bit (LSB) first. The DA is used by receiving stations to determine whether an incoming packet is addressed to a particular node. The destination address can be an individual address or a broadcast or multicast MAC address. Remember that a broadcast is all 1s—all Fs in hex— and is sent to all devices. A multicast is sent only to a similar subset of nodes on a network

Answer 29

Destination Address

Question 30

a 48-bit MAC address used to identify the transmitting device, and it uses the least significant bit first. Broadcast and multicast address formats are illegal within the SA field

Answer 30

Source Address

Question 31

uses a Length field, but the Ethernet_II frame uses a Type field to identify the Network layer protocol. The old, original 802.3 cannot identify the upper-layer protocol and must be used with a proprietary LAN—IPX, for example

Answer 31

Length or type 802.3

Question 32

is a field at the end of the frame that’s used to store the cyclic redundancy check (CRC) answer

Answer 32

Frame Check Sequence (FCS)

Question 33

is a mathematical algorithm that’s run when each frame is built based on the data in the frame. When a receiving host receives the frame and runs the CRC, the answer should be the same. If not, the frame is discarded, assuming errors have occurred

Answer 33

Cyclic Redundancy check

Question 34

they created and implemented the first Ethernet LAN specification, which the IEEE used to create the IEEE 802.3 committee. • This was a 10 Mbps network that ran on coax and then eventually twisted- pair and fiber physical media.

Answer 34

Digital, Intel, and Xerox

Question 35

is the standards body that creates the Physical layer specifications for Ethernet.

Answer 35

EIA/TIA (Electronic Industries Alliance and the newer Telecommunications Industry Association)

Question 36

10 Mbps using category 3 unshielded twisted pair (UTP) wiring for runs up to 100 meter

Answer 36

10Base-T (IEEE 802.3)

Question 37

most commonly known as Fast Ethernet, uses EIA/TIA category 5, 5E, or 6 UTP two-pair wiring. One user per segment; up to 100 meters long. It uses an RJ45 connector with a physical star topology and a logical bus.

Answer 37

100Base-TX (IEEE802.3u)

Question 38

Uses fiber cabling 62.5/125-micron multimode fiber. Point- to- point topology; up to 412 meters long. It uses ST and SC connectors, which are media interface connectors.

Answer 38

100Base-FX (IEEE 802.3u)

Question 39

Copper twisted-pair, called twinax, is a balanced coaxial pair that can run only up to 25 meters and uses a special 9-pin connector known as the High Speed Serial Data Connector (HSSDC). This is used in Cisco’s new Data Center technologies.

Answer 39

1000Base-CX (IEEE 802.3z)

Question 40

Category 5, four-pair UTP wiring up to 100 meters long and up to 1 Gbps

Answer 40

1000Base-T (IEEE 802.3ab)

Question 41

The implementation of 1 Gigabit Ethernet running over multimode fiber-optic cable instead of copper twisted-pair cable, using short wavelength laser. Multimode fiber (MMF) using 62.5- and 50-micron core; uses an 850 nanometer (nm) laser and can go up to 220 meters with 62.5-micron, 550 meters with 50-micron.

Answer 41

1000Base-SX (IEEE 802.3z)

Question 42

Single-mode fiber that uses a 9-micron core and 1300 nm laser and can go from 3 kilometers up to 10 kilometers.

Answer 42

1000Base-LX (IEEE 802.3z)

Question 43

The implementation of 1 Gigabit Ethernet running over multimode fiber-optic cable instead of copper twisted-pair cable, using short wavelength laser. Multimode fiber (MMF) using 62.5- and 50-micron core; uses an 850 nanometer (nm) laser and can go up to 220 meters with 62.5-micron, 550 meters with 50-micron.

Answer 43

1000Base-SX (IEEE 802.3z)

Question 44

Single-mode fiber that uses a 9-micron core and 1300 nm laser and can go from 3 kilometers up to 10 kilometers.

Answer 44

1000Base-LX (IEEE 802.3z)

Question 45

is a Cisco specified standard for Gigabit Ethernet communication operates on ordinary single-mode fiber-optic links with spans up to 43.5 miles (70 km)

Answer 45

* 1000Base-ZX (Cisco standard)

Question 46

s a standard proposed by the IEEE 802.3an committee to provide 10 Gbps connections over conventional UTP cables, (category 5e, 6, or 7 cables).

Answer 46

10GBase-T (802.3.an)

Question 47

allows the conventional RJ45 used for Ethernet LANs and can support signal transmission at the full 100-meter distance specified for LAN wiring.

Answer 47

10GBase-T

Question 48

THREE TYPES OF CABLES:

Answer 48

Straight-through cable • Crossover cable • Rolled cable

Question 49

e can handle speeds up to a gigabit with a distance of up to 100 meters. Typically we’d use this cable for 100 Mbps and category 6 for a gigabit, but the category 5 Enhanced is rated for gigabit speeds and category 6 is rated for 10 Gbp

Answer 49

Category 5

Question 50

used to connect the following devices: • Host to switch or hub • Router to switch or hub

Answer 50

Straight -Through cable.

Question 51

can be used to connect the following devices: • Switch to switch • Hub to hub • Host to host • Hub to switch • Router direct to host • Router to router C

Answer 51

Crossover cable( Same network)

Question 52

isn’t used to connect any Ethernet connections together, you can use a rolled Ethernet cable to connect a host EIA- TIA 232 interface to a router console serial communication (COM) port

Answer 52

Rolled cable

Question 53

The cable allows for very fast transmission of data, is made of glass (or even plastic!), is very thin, and works as a waveguide to transmit light between two ends of the fiber.

Answer 53

Fiber Optic

Question 54

has been used to go very long distances, as in intercontinental connections, but it is becoming more and more popular in Ethernet LAN networks due to the fast speeds available and because, unlike UTP, it’s immune to interference like cross-ta

Answer 54

Fiber optics

Question 55

more expensive, has a tighter cladding, and can go much farther distances than multimode.

Answer 55

Single mode

Question 56

looser and has a larger core so it allows multiple light particles to travel down the glass.

Answer 56

Multimode

Question 57

when a host transmits data across a network to another device, the data goes through a process and wrapped with protocol information at each layer of the OSI mod

Answer 57

Encapsulation

Question 58

use to communicate and exchange information in each layer.

Answer 58

• Protocol data units (PDUs)

Question 59

is a piece of data created and attached data field in transport layer.

Answer 59

Segment

Question 60

is used to get each segment to the correct network.

Answer 60

Logical Addressing

Question 61

adds a control header to the segment handed down from the Transport layer.

Answer 61

Packet or datagram

Question 62

helps us understand where things belong, how things fit together, and what functions go where helps summarize a complex collection of details into an understandable model, bringing order from the chaos

Answer 62

Hierarchy

Question 63

can help you design, implement, and maintain a scalable, reliable, cost-effective hierarchical internetwork.

Answer 63

Cisco hierarchical model

Question 64

literally the core of the network

Answer 64

Core layer

Question 65

responsible for transporting large amounts of traffic both reliably and quickly.

Answer 65

Core layer

Question 66

is to switch traffic as fast as possible

Answer 66

Core layer

Question 67

Don’t do in core layer:

Answer 67

• Never do anything to slow down traffic. This includes making sure you don’t use access lists, perform routing between virtual local area networks, or implement packet filtering. • Don’t support workgroup access here. • Avoid expanding the core (e.g., adding routers when the internetwork grows). If performance becomes an issue in the core, give preference to upgrades over expansion. CCNA Routing an

Question 68

sometimes referred to as the workgroup layer and is the communication point between the access layer and the core

Answer 68

Distribution Layer

Question 70

are to provide routing, filtering, and WAN access and to determine how packets can access the core, if needed.

Answer 70

Distribution Layer

Question 71

must determine the fastest way that network service requests are handled—for example, how a file request is forwarded to a server.

Answer 71

Distribution Layer

Question 72

controls user and workgroup access to internetwork resources. is sometimes referred to as the desktop layer.

Answer 72

Access Layer

Question 73

sometimes referred to as the desktop layer.

Answer 73

Access Layer