Cisco Modules 4-7 Exam
What type of communication rule would best describe CSMA/CD?
- Access method
What OSI physical layer term describes the physical medium for microwave transmissions?
- Air
Which statement is true about the CSMA/CD access method that is used in Ethernet?
- All network devices must listen before transmitting.
What OSI physical layer term describes the capacity at which a medium can carry data?
- Bandwidth
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
What OSI physical layer term describes the physical medium which uses electrical pulses?
- Copper cable
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 three items are contained in an Ethernet header and trailer? (Choose three.) - Source IP address - Source MAC address - Destination IP address - Destination MAC address - Error-checking information
- Source MAC address - Destination MAC address - Error-checking information
Which switching method uses the CRC value in a frame?
- Store-and-forward
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 contained in the trailer of a data-link frame?
error detection
Which two devices commonly affect wireless networks? (Choose two.) - Blu-ray players - Home theaters - Cordless phones - Microwaves - Incandescent light bulbs - External hard drives
- Cordless phones - Microwaves
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
In addition to the cable length, what two factors could interfere with the communication carried over UTP cables? (Choose two.) - Crosstalk - Bandwidth - Size of the network - Signal modulation technique - Electromagnetic interference
- Crosstalk - Electromagnetic interference
Which statement describes an extended star topology? - End devices connect to a central intermediate device which in turn connects the other central intermediate devices. - End devices are connected together by a bus and each bus connects to a century intermediate device. - Each end system is connected to it respective neighbor via an intermediate device. - All end demand intermediate devices are connected in a chain to each other.
- End devices connect to a central intermediate device which in turn connects the other central intermediate devices.
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. - Contention-based access is also known as deterministic. 802.11 utilizes CSMA/CD. - Data link layer protocols define the rules for access to different media. - Networks with controlled access have reduced performance due to data collisions.
- 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.
Which switching method has the lowest level of latency?
- Fast-forward
What are two examples of the cut-through switching method? (Choose two.) - Store-and-forward switching - Fast-forward switching - CRC switching - Fragment-free switching - QOS switching
- Fast-forward switching - Fragment-free switching
What OSI physical layer term describes the physical medium that uses the propagation of light?
- Fiber-optic cable
Which two fields or features does Ethernet examined to determine if they received frame is passed to the data link layer or discarded by the NIC? (Choose two) - auto-MDIX - CEF - Frame Check Sequence - Minimum Frame Size - Source MAC address
- Frame Check Sequence - Minimum Frame Size
Which advantage does the store-and-forward switching method have compared with the cut-through switching method?
- Frame error checking
What OSI physical layer term describes the measure of usable data transferred over a given period of time?
- Goodput
What makes fiber preferable to copper cabling for interconnecting buildings? (Choose three.) - Greater distances per cable run - Lower installation cost - Limited susceptibility to EMI/RFI - Durable connections - Greater bandwidth potential - Easily terminated
- Greater distances per cable run - Limited susceptibility to EMI/RFI - Greater bandwidth potential
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 three basic parts are common to all frame types supported by the data link layer? (Choose three.) - Header - Type field - MTU size - Data - Trailer - CRC value
- Header - Data - Trailer
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 are two characteristics of fiber-optic cable? (Choose two.) - It is not affected by EMI or RFI. - Each pair of cables is wrapped in metallic foil. - It combines the technique of cancellation, shielding, and twisting to protect data. - It typically contains 4 pairs of fiber-optic wires. - It is more expensive than UTP cabling is.
- It is not affected by EMI or RFI. - It is more expensive than UTP cabling is.
Which two statements describe the services provided by the data link layer? (Choose two.) - It defines the end-to-end delivery addressing scheme. - It maintains the path between the source and destination devices during the data transmission. - It manages the access of frames to the network media. - It provides reliable delivery through link establishment and flow control. - It ensures that application data will be transmitted according to the prioritization. - It packages various Layer 3 PDUs into a frame format that is compatible with the network interface.
- 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 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 OSI physical layer term describes the amount of time, including delays, for data to travel from one point to another?
- Latency
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. - Logical link control is specified in the IEEE 802.3 standard. - The LLC sublayer adds a header and a trailer to the data. - The data link layer uses LLC to communicate with the upper layers of the protocol suite. - The LLC sublayer is responsible for the placement and retrieval of frames on and off the media.
- Logical link control is implemented in software. - The data link layer uses LLC to communicate with the upper layers of the protocol suite.
What does the term "attenuation" mean in data communication?
- Loss of signal strength as distance increases
What OSI physical layer term describes the process by which one wave modifies another wave?
- Modulation
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 sophistication of the encapsulation method applied to the data - The type of traffic that is crossing the network - The latency that is created by the number of network devices the the data is crossing - The bandwidth of the WAN connection to the Internet the reliability of the gigabit Ethernet infrastructure of the backbone
- 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 is the auto-MDIX feature on a switch?
- The automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection
Which characteristic describes crosstalk?
- The distortion of the transmitted messages from signals carried in adjacent wires
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. - If both switches support different speeds, they will each work at their own fastest speed. - The auto-MDIX feature will configure the interfaces eliminating the need for a crossover cable. - The connection will not be possible unless the administrator changes the cable to a crossover cable. - The duplex capability has to be manually configured because it cannot be negotiated.
- 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.
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
During the encapsulation process, what occurs at the data link layer for a PC connected to an Ethernet network?
- The physical address is added.
Why are two strands of fiber used for a single fiber optic connection?
- They allow for full-duplex connectivity.
What OSI physical layer term describes the measure of the transfer of bits across a medium over a given period of time?
- Throughput
What is the purpose of the FCS field in a frame?
- To determine if errors occurred in the transmission and reception
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 the purpose of the OSI physical layer?
- Transmitting bits across the local media
Which procedure is used to reduce the effect of crosstalk in copper cables?
- Twisting opposing circuit wire pairs together
What are two actions performed by a Cisco switch? (Choose two.) - Building a routing table that is based on the first IP address in the frame header - Using the source MAC addresses of frames to build and maintain a MAC address table - Forwarding frames with unknown destination IP addresses to the default gateway - Utilizing the MAC address table to forward frames via the destination MAC address - Examining the destination MAC address to add new entries to the MAC address table
- 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 is a multicast MAC address? FF-FF-FF-FF-FF-FF 5C-26-0A-4B-19-3E 01-00-5E-00-00-03 00-26-0F-4B-00-3E
01-00-5E-00-00-03
Which media communication type does not require media arbitration in the data link layer?
Full-Duplex
A network team is comparing physical WAN topologies for connecting remote sites to a headquarters building. Which topologies provides high availability and connect some but not all remote sites?
Partial Mesh
Which statement describes a characteristic of the frame header fields of the data link layer?
They vary depending on protocols.
