CCNA 3 Flashcards by NEVAR FRANK

Which network topology allows all traffic to flow through a central hub

star

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What is true about Ethernet

802.3 protocol

10Base T half duplex

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If a router has 3 hosts connected in one port and two other hosts connected in another port, how may broadcast domains are present on the router

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On which type of device is every port in the same collision domain

a hub

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Which MTU size can cause a baby giant error

1518

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What are three characteristics of the TCP protocol

The connection is established before data is transmitted.
It ensures that all data is transmitted and received by the remote device.
It uses seperate SYN and ACK messages to establish a connection

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A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port?

This is an Ethernet port operating at half duplex

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Which three elements are fields in a basic Ethernet data frame?

Preamble
Type/length
Frame check sequence

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What interconnection cable can you use when you use a MDI connection?

Crossover

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for what two purposes does the Ethernet protocol use physical addresses

To uniquely identify devices at Layer 2

to allow communication between different devices on the same network

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In an Ethernet network, under what two scenarios can devices transmit?

When they detect no other devices are sending

When the medium is idle

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How many broadcast domains are shown in the graphic assuming only the default VLAN is configured on the switches?

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Which statement about upgrading a Cisco IOS device with TFTP server

the operation is performed in encrypted format

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Which two options are fields in an Ethernet frame?

frame check sequence

type

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Which two statements about UDP are true?

It can transmit data at a rate higher than the path capacity

It can be used for multicast and broadcast traffic

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Which two statements about fiber cable are true?

Single-mode cable is most appropriate for installations longer 10 km
Multi-mode cable supports speeds between 100 Mbps and 100 Gbps

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Which statements correctly describe steps in the OSI data encapsulation process?

The transport layer divides a data stream into segments and may add reliability and flow control information
Packets are created when the network layer adds Layer 3 addresses and control information to a segment.

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What layers of the OSI Model is included in TCP/IP Model’s INTERNET layer?

Network

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Where does routing occur within the DoD TCP/IP reference model?

internet

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Which of the following correctly describe steps in the OSI data encapsulation process

The transport layer divides a data stream into segments and may add reliability and flow control information.
Packets are created when the network layer adds Layer 3 addresses and control information to a segment.

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Which layer in the OSI reference model is responsible for determining the availability of the receiving program and checking to see if enough resources exist for that communication?

application

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Which networking technology is currently recognized as the standard for computer networking?

Transmission

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Which three encapsulation layers in the OSI model are combined into the TCP/IP application layer?

Session
Presentation
Application

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On which layer TCP/IP is ACL APIC-EM path

Layer 4(Application layer)

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which option is the benefit of implementing an intelligent DNS for a cloud computing solution?

It can redirect user requests to locations that are using fewer network resources.

What are the three major components of Cisco network virtualization

network access control path isolation virtual network services

Which three technical services support cloud computing?

layer 3 networking routing ip localization extended SAN services

Which major component of the network virtualization architecture isolate users according to policy?

network access control

Which three options are the major components of a network virtualization architecture?

Virtual network services network access control path isolation

Which cloud service is typically used to provide DNS and DHCP services to an enterprise?

IaaS (Infrastructure as a service)

Which command can you enter to determine whether serial interface 0/2/0 has been configured using HDLC encapsulation?

router#show interfaces S0/2/0

Which layer 2 protocol encapsulation type supports synchronous and asynchronous circuits and has built-in security mechanisms?

PPP (Point to point protocol)

Which statements about using leased lines for your WAN infrastructure are true?

Leased lines with sufficient bandwidth can avoid latency between endpoints. Leased lines require little installation and maintenance expertise.

Which of the following describes the roles of devices in a WAN?

A CSU/DSU (channel service unit/data service unit) terminates a digital local loop A modem terminates an analog local loop A router is commonly considered a DTE (Data terminal equipment) device

Which two pieces of information are provided by the "show controllers serial 0" command?

The type of cable that is connected to the interface | the status of the physical layer of the interface

Which command is used to know the duplex speed of serial link?

Show interface

Which WAN topology provides a direct connection from each site to all other sites on the network

full mesh

What are three reasons that an organization with multiple branch offices and roaming users might implement a Cisco VPN solution instead of point-to-point WAN links?

reduced cost increased security scalability

True or False: | DWDM (dense wavelength division multiplexing) allows a single strand of fiber to support bidirectional communications

True

True or False: | DWDM (dense wavelength division multiplexing) is used for long-distance and submarine cable systems

True

True or False: | DWDM (dense wavelength division multiplexing) supports both the SDH and SONET standards

True

True or False: | DWDM (dense wavelength division multiplexing)can multiplex up to 256 channels on a single fiber

False

True or False: | DWDM (dense wavelength division multiplexing)can carry up to a 1-Gbps signal on each channel

False

True or False: | DWDM (dense wavelength division multiplexing) supports simplex communications over multiple strands of fiber

False

which PPP subprotocol negotiates authentication options?

LCP (Link control protocol)

Which benefit of implementing a dual-homed WAN connection instead of a single-homed connection is true?

Only dual-homed connections enable an individual router to tolerate the loss of a network link

Which two statements about using the CHAP authentication mechanism in a PPP link are true?

CHAP (Challenge handshake authentication protocol) uses a three-way handshake CHAP authentication periodically occurs after link establishment.

A network administrator needs to configure a serial link between the main office and a remote location. The router at the remote office is a non-Cisco router. How should the network administrator configure the serial interface of the main office router to make the connection?

Main(config)# interface serial 0/0 Main(config)#ip address 172.16.1.1 255.255.255.252 encapsulation ppp no shut

What is the benefit of point-to-point leased line?

simply configuration

When you deploy multilink PPP on your network, where must you configure the group IP address on each device?

Under the multilink interface

What are two authentication types of MLPPP (Multilink PPP)

PAP (password authentication protocol) | CHAP

At which layer of the OSI model does PPP perform?

Layer 2 (Data layer)

Which command is used to enable CHAP authentication with PAP as the fallback method on a serial interface?

(config-if)# ppp authentication chap pap

Which two authentication methods are compatible with MLPPP on a serial interface?

CHAP | PAP

Which statement about QoS default behavior is true?

Packets that arrive with a tag are untagged at the edge of an administrative domain.

What 8-bit field exists in IP packet for QoS?

Tos Field

Which feature can you implement to reserve bandwidth for VoIP calls across the call path?

RSVP

What does traffic shaping do to reduce congestion in a network?

buffers and queues packets

in which byte of an IP packet can traffic be marked?

the ToS byte

Which function does traffic shaping perform?

It buffers and queues excess packets

Which option is the main function of congestion management

queuing traffic based on priority

Which QoS tool can you use to optimize voice traffic on a network that is primarily intended for data traffic

PQ (Performance quality)

Which two QoS tools can provide congestion management

``` CBWFQ (class based weighted fair queuing) PQ ```

Which function does traffic shaping perform?

It bufferes and queues excess packets