MODULE 4 NETWORKING

• A network administrator is measuring the transfer of bits across the company backbone for a mission critical financial application. The administrator notices that the network throughput appears lower than the bandwidth expected. Which three factors could influence the differences in throughput? (Choose three.) the amount of traffic that is currently crossing the network the type of traffic that is crossing the network the latency that is created by the number of network devices that the data is crossing
• What are two characteristics of fiber-optic cable? (Choose two.) It is not affected by EMI or RFI. It is more expensive than UTP cabling is.
• What is a primary role of the Physical layer in transmitting data on the network? create the signals that represent the bits in each frame on to the media
• With the use of unshielded twisted-pair copper wire in a network, what causes crosstalk within the cable pairs? the magnetic field around the adjacent pairs of wire
• Refer to the graphic. What type of cabling is shown? fiber
• In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? (Choose two.) crosstalk electromagnetic interference
• Refer to the graphic. What type of cabling is shown? UTP
• Which two devices commonly affect wireless networks? (Choose two.) cordless phones microwaves
• Which two statements describe the services provided by the data link layer? (Choose two.) It manages the access of frames to the network media. It packages various Layer 3 PDUs into a frame format that is compatible with the network interface.
• What is the function of the CRC value that is found in the FCS field of a frame? to verify the integrity of the received frame
• What is contained in the trailer of a data-link frame? error detection
• Which statement describes a characteristic of the frame header fields of the data link layer? They vary depending on protocols.
• A network team is comparing physical WAN topologies for connecting remote sites to a headquarters building. Which topology provides high availability and connects some, but not all, remote sites? partial mesh
• Which two fields or features does Ethernet examine to determine if a received frame is passed to the data link layer or discarded by the NIC? (Choose two.) Frame Check Sequence minimum frame size
• Which media communication type does not require media arbitration in the data link layer? full-duplex
• Which statement describes an extended star topology? End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.
• What is a characteristic of the LLC sublayer? It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media
• What are three ways that media access control is used in networking? (Choose three.) Ethernet utilizes CSMA/CD. Media access control provides placement of data frames onto the media. Data link layer protocols define the rules for access to different media.
• During the encapsulation process, what occurs at the data link layer for a PC connected to an Ethernet network? The physical address is added
• What three items are contained in an Ethernet header and trailer? (Choose three.) source MAC address destination MAC address error-checking information
• What type of communication rule would best describe CSMA/CD? access method
• Which three basic parts are common to all frame types supported by the data link layer? (Choose three.) header data trailer
• Which statement is true about the CSMA/CD access method that is used in Ethernet? All network devices must listen before transmitting
• What is the auto-MDIX feature on a switch the automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection
• A Layer 2 switch is used to switch incoming frames from a 1000BASE-T port to a port connected to a 100Base-T network. Which method of memory buffering would work best for this task? shared memory buffering
• What are two examples of the cut-through switching method? (Choose two.) fast-forward switching fragment-free switching
• Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding the frame? store-and-forward switching
• What is the purpose of the FCS field in a frame? to determine if errors occurred in the transmission and reception
• Which switching method has the lowest level of latency? fast-forward
• A network administrator is connecting two modern switches using a straight-through cable. The switches are new and have never been configured. Which three statements are correct about the final result of the connection? (Choose three.) The link between the switches will work at the fastest speed that is supported by both switches. The link between switches will work as full-duplex. The auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable.
• Which advantage does the store-and-forward switching method have compared with the cut-through switching method? frame error checking
• When the store-and-forward method of switching is in use, what part of the Ethernet frame is used to perform an error check? CRC in the trailer
• Which switching method uses the CRC value in a frame? store-and-forward
• What are two actions performed by a Cisco switch? (Choose two.) using the source MAC addresses of frames to build and maintain a MAC address table utilizing the MAC address table to forward frames via the destination MAC address
• Which two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.) Logical link control is implemented in software. The data link layer uses LLC to communicate with the upper layers of the protocol suite.
• What is the auto-MDIX feature? It enables a device to automatically configure an interface to use a straight￾through or a crossover cable.
• What is one advantage of using the cut-through switching method instead of the store-and-forward switching method? has a lower latency appropriate for high-performance computing applications
• Which is a multicast MAC address? 01-00-5E-00-00-03
• What OSI physical layer term describes the process by which one wave modifies another wave? modulation
• What OSI physical layer term describes the capacity at which a medium can carry data? bandwith