C06 - Network Fundamentals Flashcards
\_\_\_\_\_\_\_\_ is immune to electromagnetic or radio-frequency interference. A. Twisted-pair cabling B. CSMA/CD C. Broadband coaxial cabling D. Fiber-optic cabling
D. Companies that want to ensure the safety and integrity of their data should use fiberoptic
cable because it is not affected by electromagnetic or radio-frequency interference.
Even though some copper cables have shielding, they are not immune to EMI or RFI. This
eliminates twisted-pair and coaxial. CSMA/CD is an access method, not a cable type.
Which IEEE 802 standard defines a bus topology using coaxial baseband cable and is able to transmit at 10Mbps? A. 802.1 B. 802.2 C. 802.3 D. 802.5
C. The IEEE 802.3 standard originally specified a bus topology that uses coaxial baseband
cable, and it can transmit data up to 10Mbps.
Which OSI layer signals “all clear” by making sure that the data segments are error free? A. Application layer B. Session layer C. Transport layer D. Network layer
C. It is the responsibility of the Transport layer to signal an “all clear” by making sure
that the data segments are error free. It also controls the data flow and troubleshoots
any problems with transmitting or receiving data frames.
________ is the type of media access method used by NICs that listen to or
sense the cable to check for traffic and send only when they hear that no one else is transmitting.
A. Token passing
B. CSMA/CD
C. CSMA/CA
D. Demand priority
B. Carrier Sense Multiple Access with Collision Detection (CSMA/CD) specifies that
the NIC pause before transmitting a packet to ensure that the line is not being used. If
no activity is detected, then it transmits the packet. If activity is detected, it waits until
it is clear. In the case of two NICs transmitting at the same time (a collision), both
NICs pause to detect and then retransmit the data.
What model is used to provide a common way to describe network protocols? A. OSI B. ISO C. IEEE D. CSMA/CD
A. The Open Systems Interconnection (OSI) model is used to describe how network
protocols should function. The International Organization for Standardization (ISO)
designed the OSI model.
A physical star topology consists of several workstations that branch off a central device called a(n) \_\_\_\_\_\_\_\_\_\_\_\_\_ . A. NIC B. Bridge C. Router D. Hub
D. A hub or a switch is at the center of a star topology. A NIC is a network card,
which each computer must have to be on the network. Bridges and routers are higherlevel
connectivity devices that connect network segments or networks together.
Of all the network cabling options, \_\_\_\_\_\_\_\_\_\_\_\_ offers the longest possible segment length. A. Unshielded twisted-pair B. Coaxial C. Fiber-optic D. Shielded twisted-pair
C. Fiber-optic cable can span distances of several kilometers because it has much lower
attenuation, crosstalk, and interference as compared to copper cables.
What devices transfer packets across multiple networks and use tables to store network
addresses to determine the best destination?
A. Routers
B. Bridges
C. Hubs
D. Switches
A. Routers are designed to route (transfer) packets across networks. They are able to
do this routing, determining the best path to take, based on the internal routing tables
that they maintain.
In which network design do users access resources from other workstations rather than from a central location? A. Client-server B. Star C. Ring D. Peer-to-peer
D. A peer-to-peer network has no servers, so all of the resources are shared from the
various workstations on which they reside. This is the opposite of a client-server network,
in which the majority of resources are located on servers that are dedicated to
responding to client requests.
Which of the following wireless communication standards is often described in terms of a wireless personal area network? A. Bluetooth B. Infrared C. Cellular D. Ethernet
A. Bluetooth networks are often called wireless personal area networks (WPANs).
Which of the following statements are not associated with a star network? (Choose all that
apply.)
A. A single cable break can cause complete network disruption.
B. All devices connect to a central device.
C. It uses a single backbone computer to connect all network devices.
D. It uses a dual-ring configuration.
A, C, D. In a star network, all systems are connected using a central device such as a
hub or a switch. The network is not disrupted for other users when more systems are
added or removed. The star network design is used with today’s UTP-based networks.
If you are going to run a network cable in the space above the drop ceiling in your office, which type of cable should you use? A. Plenum B. PVC C. Coaxial D. Fiber-optic
A. For areas where a cable must be fire retardant, such as in a drop ceiling, you must
run plenum-grade cable. Plenum refers to the coating on the sleeve of the cable, not the
copper or fiber within the cable itself. PVC is the other type of coating typically found
on network cables, but it produces poisonous gas when burned.
Which of the following connector types is an MFF connector? A. BNC B. ST C. SC D. LC
D. The local connector (LC) is a mini form factor (MFF) fiber-optic connector developed
by Lucent Technologies. If it helps, think of LC as “Little Connector.”
What Ethernet specification would you be running if you needed to make a connection of
10Gbps over a distance of five kilometers?
A. 10GBaseER
B. 10GBaseT
C. 10GBaseSR
D. 10GBaseLR
A. If you need to make a connection that is 5 kilometers long, then you are limited to
fiber-optic cable, specifically SMF. The two common SMF standards are 10GBaseER
and 10GBaseEW. (Think of the E as extended.) A T designation in an Ethernet standard
refers to twisted pair. SR and LR are fiber standards that do not stretch for 5 kilometers.
You have been asked to configure a full mesh network with seven computers. How many connections will this require? A. 6 B. 7 C. 21 D. 42
C. In a mesh network, the number of connections is determined by the formula
(x × (x – 1)) ÷ 2. With seven computers, that amounts to 21 connections.
