IS435 CH5 11e

How long (in milliseconds) is a clock cycle if I transmit 400 Mbps with four states? A) 0.000005 B) 0.0025 C) 0.005 D) none of the above

A) 0.000005

If you double the number of states, you can transmit ________ more bit(s) per clock cycle. A) 1 B) 2 C) 4 D) none of the above

A) 1

In large Ethernet networks, there can be ________ possible data links between two hosts. A) 1 B) 2 C) 3 D) many

A) 1

If a physical link can use either 4-pair UTP, multimode fiber, or single-mode fiber, which should I use? A) 4-pair UTP B) multimode fiber C) single-mode fiber D) none of the above

A) 4-pair UTP

Which core diameter is used in multimode fiber. A) 50 microns B) 8 microns C) 50 mm D) 8 mm

A) 50 microns

The 802.11ac Wi-Fi standard uses 256 states. How many bits can it send per clock cycle? A) 8 B) 16 C) 32 D) none of the above

A) 8

To prevent anyone from simply walking up to a corporate switch and plugging their computer into its Ethernet port, companies can use ________. A) 802.1X B) SNMP C) VLANs D) 802.1AE

A) 802.1X

Which light wavelength dominates in LANs? A) 850 nm B) 1,310 nm C) 1,550 nm D) 1 Gbps

A) 850 nm

In optical fiber, light travels through the ________. A) core B) cladding C) both A and B

A) core

Trunk links connect switches to ________ switches. A) core B) workgroup C) both A and B D) neither A nor B

A) core

Ethernet messages are ________. A) frames B) packets C) segments D) not named

A) frames

Ethernet became the dominant LAN technology because of ________. A) low cost B) high speed C) link reliability D) agility

A) low cost

Modal dispersion limits transmission distance in ________. A) multimode fiber B) single-mode fiber C) both A and B D) neither A nor B

A) multimode fiber

A local area network operates ________. A) on a customer premises B) between customer premises C) both A and B D) neither A nor B

A) on a customer premises

At what layer is the 100BASE-TX standard? A) physical B) data link C) Internet D) physical and data link

A) physical

Ethernet standards are specified at the ________ layer. A) physical B) Internet C) both A and B D) neither A nor B

A) physical

UTP and fiber distance limits are for ________. A) physical links B) data link C) Internet routes D) physical and data link

A) physical links

Having only a single possible path between devices ________. A) reduces switching cost B) provides reliability C) reduces errors D) none of the above.

A) reduces switching cost

The PAD field is added by the ________ if the frame is too short without it. A) sender B) receiver C) both A and B D) neither A nor B

A) sender

Physical layer standards govern ________. A) signaling B) frames C) packets D) all of the above

A) signaling

If you can span the distance between two switches with either a single optical fiber link or two UTP lengths with an intermediate switch, which should you choose? A) single optical fiber link B) two UTP cords with an intermediate switch C) both are equally attractive D) neither will work

A) single optical fiber link

Ethernet forwarding devices are ________. A) switches B) routers C) access points D) both A and B

A) switches

850 nm multimode fiber is used in LANs ________. A) to keep cost low B) to have the longest transmission distances C) both A and B D) neither A nor B

A) to keep cost low

What is binary 0010 in hex? A) 1 B) 2 C) 3 D) none of the Above

B) 2

A system with 16 states can transmit ________ bits per clock cycle A) 3 B) 4 C) 5 D) none of the above

B) 4

What type of copper wiring is widely used in Ethernet? A) optical fiber B) 4-pair UTP C) both A and B D) neither A nor B

B) 4-pair UTP

________ is the official name for Ethernet addresses. A) MAC B) EUI-48 C) both A and B D) neither A nor B

B) EUI-48

The ARP cache gives the ________ of a router the host will send a packet to. A) IP address B) EUI-48 address C) MAC address D) host name

B) EUI-48 address

What is the quality designator for multimode optical fiber? A) Cat B) OM C) both A and B D) neither A nor B

B) OM

________ fiber is being sold today. A) OM2 B) OM4 C) both A and B D) neither A nor B

B) OM4

4-pair UTP terminates in a(n) ________ connector. A) USB B) RJ-45 C) SC D) standard telephone

B) RJ-45

Which UTP quality levels are needed to send signals 100 meters at 10 gigabits per second? A) category 6 B) category 6A C) both A and B D) neither A nor B

B) category 6A

What type of switch connects switches to other switches? A) trunk switches B) core switches C) workgroup switches D) none of the above

B) core switches

The path a message takes from the source host to the destination device in an Ethernet network is a ________. A) physical link B) data link C) route D) label-switched route

B) data link

The ability to transmit in two directions simultaneously is ________. A) parallel communication B) full-duplex communication C) both A and B D) neither A nor B

B) full-duplex communication

Ethernet has reliability issues because of its ________. A) too-simple switch operation B) hierarchical organization C) both A and B D) neither A nor B

B) hierarchical organization

In 4-pair UTP, what is twisted? A) individual wires B) pairs of wires C) all eight wires D) none of the above

B) pairs of wires

For what specific purpose were the 2.5GBASE-T and 5GBASE-T standards developed? A) general growth in demand for Ethernet speed B) serving access points C) to provide lower-cost service than 10G-BASE-T D) none of the above

B) serving access points

Fiber that has a core diameter of 8.3 microns is ________. A) multimode fiber B) single-mode fiber C) full duplex fiber D) exceptionally fast

B) single-mode fiber

The main benefit of parallel transmission over serial transmission is ________. A) reliability B) speed C) both A and B D) neither A nor B

B) speed

Signal state is held constant in a clock cycle ________. A) for energy efficiency B) to make it easier for the receiver to sample the state C) to emphasize differences between clock cycles D) none of the above

B) to make it easier for the receiver to sample the state

CAT 5e and CAT 6 wiring can carry Ethernet traffic 100 meters up to ________. A) 10 Mbps B) 100 Mbps C) 1 Gbps D) 10 Gbps

C) 1 Gbps

What is F hex in binary? A) 1001 B) 1010 C) 1111 D) none of the above

C) 1111

To transmit five bits per clock cycle, you must have ________ states. A) 5 B) 16 C) 32 D) none of the above

C) 32

To transmit three bits per clock cycle, you must have ________ states. A) 3 B) 6 C) 8 D) 16

C) 8

What 802 Working Group creates Ethernet standards? A) 802.1 B) 802.2 C) 802.3 D) 802.11

C) 802.3

________ links connect users to workgroup switches. A) Trunk B) Core C) Access D) Workgroup

C) Access

________ occurs when the light energies of two pulses arrive at the far end at overlapping times. A) Multimode transmission B) Modal bandwidth C) Modal dispersion D) Modal interference

C) Modal dispersion

Which of the following provides security in Ethernet? A) RSTP B) SNMP C) VLANs D) all of the above

C) VLANs

In digital signaling, there is (are) ________ state(s). A) one B) only two C) a small number of D) an infinite number of

C) a small number of

Ethernet standards are specified at the ________ layer. A) physical B) data link C) both A and B D) neither A nor B

C) both A and B

In Ethernet, switches are organized in a ________. A) ring B) mesh C) hierarchy D) any of the above

C) hierarchy

Using RSTP to provide backup links in Ethernet ________. A) is automatic B) is simple C) is challenging D) is impossible

C) is challenging

The two tag frames provide information about ________. A) transmission media B) the length of Jumbo packets C) priority D) all of the above

C) priority

What problem limits transmission distance in 4-pair UTP? A) reflection at the two ends B) heat conduction C) radiation D) none of the above

C) radiation

The longest transmission distances are possible with ________. A) USB B) UTP C) single-mode fiber D) multimode fiber

C) single-mode fiber

When a user attempts to plug into an Ethernet switch protected by 802.1X, ________. A) the switch will freeze B) the switch port will freeze C) the user will be required to authenticate himself or herself D) none of the above

C) the user will be required to authenticate himself or herself

________ describe light entering a fiber's core at different angles. A) Co-cycle waves B) Harmonics C) Divergences D) Different modes

D) Different modes

After an ARP cache poisoning attack, the ARP cache gives the ________. A) IP address of the router the user wishes to send to B) EUI-48 address of the router the user wishes to send to C) IP address of the router the MITM attacker D) EUI-48 address of the router the MITM attacker

D) EUI-48 address of the router the MITM attacker

ARP cache poisoning is ________. A) a DoS attack B) a DDoS attack C) an illegal login attack D) a man-in-the middle attack

D) a man-in-the middle attack

To span the distance between two switches, why is adding an intermediate switch not an attractive choice? A) latency B) errors C) speed restrictions D) expense

D) expense

Optical fiber cords use two strands ________. A) for reliability through redundancy B) to form a complete electrical loop C) to double the transmission speed D) for full-duplex transmission

D) for full-duplex transmission

Optical fiber cords typically have two fiber strands. This is done to allow ________. A) redundancy B) total redundancy C) half-duplex operation D) full-duplex operation

D) full-duplex operation

Ethernet standards are specified at the ________ layer. A) Internet B) transport C) both A and B D) neither A nor B

D) neither A nor B

Which of the following letters may appear in EUI-48 addresses? A) D B) H C) both A and B D) neither A nor B

D) neither A nor B

Four-pair UTP uses ________ connectors. A) universal B) binary C) ST or SC D) none of the above

D) none of the above

What type of switch connects users to the network? A) user switches B) core switches C) access switches D) workgroup switches

D) workgroup switches

T/F A switch knows the entire data link between the source and destination hosts.

FALSE

T/F The switch knows the type of device it is forwarding a frame to.

FALSE

T/F In this book, we use the terms Ethernet and 802.3 interchangeably.

TRUE

What is 9 hex in binary? A) 1000 B) 1001 C) 1010 D) 1111

B) 1001

What is binary 1111 in hex? A) 10 B) 13 C) 14 D) 15

D) 15

How many wires are there is a UTP Ethernet cord? A) 1 B) 2 C) 4 D) 8

D) 8

What is binary 0000 in hex? A) 0 B) 1 C) 15 D) 16

A) 0

UTP categories rate the ________ of UTP cabling. A) quality B) speed C) quality-of-service performance D) error performance

A) quality

Ethernet addresses were formerly called ________ addresses. A) MAC B) EUI-48 C) both A and B D) neither A nor B

A) MAC

To manage their Ethernet networks, companies rely on ________. A) SNMP B) HTTP C) FTTH D) none of the above

A) SNMP

________ links connect switches to other switches. A) Trunk B) Long C) Access D) Workgroup

A) Trunk

The strength of a wave is its ________. A) amplitude B) frequency C) wavelength D) force

A) amplitude

Which UTP quality levels can send signals at 10 gigabits per second? A) category 6 B) category 6A C) both A and B D) neither A nor B

C) both A and B

Which of the following is used most often in LANs for fiber transmission links? A) 850 nm multimode fiber B) 850 nm single-mode fiber C) 850 nm multimode-mode fiber D) 1,550 nm single-mode fiber

A) 850 nm multimode fiber

What organization (most specifically) creates Ethernet standards? A) IEEE B) IETF C) ISO D) OSI

A) IEEE

In binary signaling, there is (are) ________ state(s). A) one B) two C) between three and ten D) an infinite number of

B) two

The distance between two corresponding points in adjacent cycles is the ________. A) frequency B) wavelength C) bandwidth D) span

B) wavelength

Two switches that are 200 m apart at a speed of 20 Gbps should be connected using ________. A) 10GBASE-SR B) 100GBASE-SR C) 10GBASE-SR with bonding D) 100GBASE-SR with bonding

C) 10GBASE-SR with bonding

Physical layer standards govern ________. A) signaling B) physical connectors C) both A and B D) neither A nor B

C) both A and B

RSTP ________. A) can increase reliability B) was created to break accidental loops C) both A and B D) neither A nor B

C) both A and B

To prevent an unauthorized user from sending supervisory commands to switches, companies use ________. A) 802.1X B) SNMP C) VLANs D) 802.1AE

D) 802.1AE

Which of the following is used most often in LANs for fiber transmission links? A) modal bandwidth fiber B) 1.550 nm fiber C) single-mode fiber D) multimode fiber

D) multimode fiber

EUI-48 addresses in expressed in hexadecimal notation if used by ________. A) switches B) routers C) both A and B D) neither A nor B

D) neither A nor B

T/F All Ethernet switches are manageable.

FALSE