CISCO Chapter 4 Quiz
What is a characteristic of a WAN hub-and-spoke topology?
A hub-and-spoke topology is a WAN version of the star topology in which a central site interconnects branch sites using point-to-point links. A mesh topology requires that every end system be interconnected to every other system using point-to-point links. A partial mesh is a variation of this topology, where some but not all end devices are interconnected. There is no topology where all the sites have to have hub devices that are connected to a router.
Refer to the exhibit. One end of the cable is terminated as displayed, and the other end is terminated in accordance with the T568A standard. What type of cable would be created in this manner?
A straight-through cable can have either a T568A or T568B standard termination at one end and the same at the other end. A crossover cable has a T568A standard termination at one end and a T568B standard at the other end. A rollover cable can have either a T568A or T568B standard termination at one end, and at the other end have the same standard, but with the wires connected in reverse order. A fiber-optic cable is not terminated using RJ-45 connectors.
Which statement describes a characteristic of the frame header fields of the data link layer?
All data link layer protocols encapsulate the Layer 3 PDU within the data field of the frame. However, the structure of the frame and the fields that are contained in the header vary according to the protocol. Different data link layer protocols may use different fields, like priority/quality of service, logical connection control, physical link control, flow control, and congestion control.
A network team is comparing topologies for connecting on a shared media. Which physical topology is an example of a hybrid topology for a LAN?
An extended star topology is an example of a hybrid topology as additional switches are interconnected with other star topologies. A partial mesh topology is a common hybrid WAN topology. The bus and ring are not hybrid topology types.
What method is used to manage contention-based access on a wireless network?
Carrier sense multiple access with collision avoidance (CSMA/CA) is used with wireless networking technology to mediate media contention. Carrier sense multiple access with collision detection (CSMA/CD) is used with wired Ethernet technology to mediate media contention. Priority ordering and token passing are not used (or not a method) for media access control.
What does error detection do?
Checks if the frame has been damaged during the transfer.
Which is a function of the Logical Link Control (LLC) sublayer?
Defining the media access processes that are performed by the hardware and providing data link layer addressing are functions of the MAC sublayer. The data link layer accepts Layer 3 packets and packages them into data units that are called frames.
Which statement correctly describes frame encoding?
Frame encoding converts a stream of data bits into a predefined code that is recognized by both the sender and receiver. These codes are used for a variety of purposes, such as distinguishing data bits from control bits, and identifying the beginning and end of a frame.
Which method of data transfer allows information to be sent and received at the same time?
Full duplex
What makes fiber preferable to copper cabling for interconnecting buildings?
Greater distances per cable run, limited susceptibility to EMI/RFi, and greater bandwidth potential
What does addressing do?
Helps to direct the frame toward its destination.
What does frame start do?
Helps to direct the frame toward its destination.
Refer to the exhibit. What is the maximum possible throughput between the PC and the server?
The maximum throughput between any two nodes on a network is determined by the slowest link between those nodes.
Which two factors influence the method is used for media access control?
The media access control method used depends on the topology (how the connection between the nodes appears to the data link layer), and how the nodes share the media. The type of data generated by end devices applications, the way signals are encoded by the NICs on end devices, and even the way the IP protocol forwards the packet through the network have no influence on the choice of the method used for media access control.
What is the purpose of the OSI physical layer?
The physical layer is responsible for transmitting the actual signals across the physical media as bits. Exchanging frames, controlling media access, and performing error detection are all functions of the data link layer.
STP is..........?
This type of copper media is used in industrial or similar environments where there is a lot of interference.
Optical fiber........?
This type of media is used for high transmission speed and can also transfer data over long distances
Wireless is..........?
This type of media provides most mobility options.
Coaxial is..........?
Traditionally used for television but can now be used in a network to connect the customer location to the wiring of the customer premises.
What type of cable is used to connect a workstation serial port to a Cisco router console port?
UTP cable wire pairs can be terminated in different configurations for use in different applications. To use a UTP cable for consoling into a Cisco router from a PC serial port, it must be terminated as a rollover or console cable.
What does type do?
Used by the LLC to identify the Layer 3 protocol.
A network administrator is designing a new network infrastructure that includes both wired and wireless connectivity. Under which situation would a wireless connection be recommended?
When the end-user devices need mobility to connect to the network, wireless is recommended. If an end-user device only has an Ethernet NIC, the user will only be able to use Ethernet cabling. If RFI is an issue, wireless is not recommended. An end-user device that requires a dedicated connection for performance would perform better with a dedicated Ethernet cable.
In fiber optic media, the signals are represented as patterns of _______?
light
