Cisco CCNA Modules 4-7

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 auto-MDIX feature?

It enables a device to automatically configure an interface to use a straight-through or a crossover cable.

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. Multicast MAC addresses begin with the special value of 01-00-5E.

What are two actions performed by a Cisco switch? (Choose two.)

1. using the source MAC addresses of frames to build and maintain a MAC address table
2. utilizing the MAC address table to forward frames via the destination MAC address

Which switching method uses the CRC value in a frame?

store-and-forward

Refer to the exhibit. What is the destination MAC address of the Ethernet frame as it leaves the web server if the final destination is PC1?

00-60-2F-3A-07-CC

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 auto-MDIX feature on a switch?

the automatic configuration of an interface for a straight-through or a crossover Ethernet cable connection

What are two examples of the cut-through switching method? (Choose two.)

fragment-free switching
fast-forward switching

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 two statements describe features or functions of the logical link control sublayer in Ethernet standards? (Choose two.)

The data link layer uses LLC to communicate with the upper layers of the protocol suite.
Logical link control is implemented in software.

Which advantage does the store-and-forward switching method have compared with the cut-through switching method?

frame error checking

Which functions are performed at the MAC sublayer of the OSI data link layer?

- Implements a trailer to detect transmission errors.
- Controls the NIC responsible for sending and receiving data on the physical medium.
- Provides a mechanism to allow multiple devices to communicate over a shared medium.
- Integrates various physical technologies.
- Provides synchronization between source and target nodes.

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

Which two devices commonly affect wireless networks? (Choose two.)

cordless phones
microwaves

What action will occur if a switch receives a frame and does have the source MAC address in the MAC table?

The switch refreshes the timer on that entry.

What does the term "attenuation" mean in data communication?

loss of signal strength as distance increases

The PC is connected to the console port of the switch. All the other connections are made through FastEthernet links. Which types of UTP cables can be used to connect the devices?​

Device to Switch/Router: rollover, Switch-Router: straight-through, Router-Router: crossover

What makes fiber preferable to copper cabling for interconnecting buildings? (Choose three.)

- greater distances per cable run
- limited susceptibility to EMI/RFI
- greater bandwidth potential

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.

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

What is contained in the trailer of a data-link frame?

error detection

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.

Which statement is true about the CSMA/CD access method that is used in Ethernet?

All network devices must listen before transmitting.

Which media communication type does not require media arbitration in the data link layer?

full duplex

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

What type of communication rule would best describe CSMA/CD?

access method

Which procedure is used to reduce the effect of crosstalk in copper cables?

**twisting opposing circuit wire pairs together**

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?

* **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**

Which statement describes a characteristic of the frame header fields of the data link layer?

**They vary depending on protocols.**

Which statement describes an extended star topology?

**End devices connect to a central intermediate device, which in turn connects to other central intermediate devices.**

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

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**

Refer to the exhibit. The PC is connected to the console port of the switch. All the other connections are made through FastEthernet links. Which types of UTP cables can be used to connect the devices?​

rollover, straight thru, crossover

What OSI physical layer term describes the process by which one wave modifies another wave?

modulation

What OSI physical layer term describes the physical medium which uses electrical pulses?

* **copper cable**

What OSI physical layer term describes the physical medium for microwave transmissions?

air

What action will occur if a switch receives a frame with the destination MAC address FF:FF:FF:FF:FF:FF?

The switch forwards it out all ports except the ingress port.

Which type of UTP cable is used to connect a PC to a switch port?

straight-thru