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