Set of flashcards NRS-1 (Page 1 of 6)

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Students	11
Language	English
Category	Computer Science
Level	Other
Created / Updated	01.05.2013 / 04.01.2019
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You are configuring your Alcatel-Lucent 7750SR Service Router from the Command Line Interface (CLI), and after entering a lengthy command, wish to return directly to the ROOT context. Which control command allows you to do this quickly?

Ctrl-z

Ctrl-c

Esc

Shift-Page Down

Which of the following best describes a repeater?

A passive device simply used to connect two or more cables. Does not generate or amplify any signals

A device that receives and retransmits a signal out its ports, but does not do any Layer 2 analysis of the data

A device that receives a signal and based on the Layer 2 destination address, makes a decision on which ports the signal should be retransmitted

A device that receives a signal and based on the Layer 3 destination address, makes a decision on which ports the signal should be retransmitted

How do protocols such as ATM and Frame-Relay support differentiating multiple customers or traffic types on the same physical wire?

ATM and Frame-Relay are circuit switched protocols and use Virtual Circuits to create logical separation of traffic

ATM and Frame-Relay are point-to-point protocols and do not support different customers or traffic type on the same physical wire

ATM and Frame-Relay are circuit switched protocols and use VLAN s to create logical separation of traffic

ATM and Frame-Relay are circuit switched protocols and use IP Header information to create logical separation of traffic

Which of the following is a feature of Layer 3?

Provides an universal addressing scheme

Ensures data is delivered across the Layer 2 network

Provides reliable data transfers

Provides a physical interface to the network

The 201148260/24 network is subnetted using a /26 mask. How many subnets and host addresses will you obtain with this mask?

4 subnets, 64 hosts

64 subnets, 4 hosts

4 subnets, 62 hosts

64 subnets, 2 hosts

6 subnets, 30 hosts

What kind of information can a Dynamic Host Configuration Protocol (DHCP) client receive?

Details of the configuration settings of each router on the network

A list of other DHCP clients

IP addresses and their lease times

Server time information

Choose two true statements that characterize Link State Routing

Routers send a copy of their routing table to their neighbors periodically

Routers flood link information throughout the entire area

Network converges quickly (within several seconds) after a topology change

Routers do not have precise knowledge of the entire network topology

Which statement accurately explains the purpose of the TCP protocol and what it provides?

The primary purpose of TCP is to provide reliable communications between application services

The primary purpose of TCP is to provide unreliable communications between application services

The primary purpose of TCP is to provide IP routing between application services

The primary purpose of TCP is to define the correct format for the application layer such as JPEG or HTML

Which of the following is the best description of well known ports?

Well known ports apply to routers only and are used for communication and control traffic. Well known port numbers are assigned by IANA and can have any value

Well known ports are used by TCP and UDP. Well known port numbers range from 1024 to 65535 and are assigned by IANA

Well known port numbers are used by both TCP and UDP. Well known port numbers range from 1 to 1023 and are assigned by IANA

Well known ports numbers are used by TCP only. Well known port numbers are assigned by IANA and can have any value

Which organization first considered cross-platform networking support to be a necessity?

IBM

US Military

Alcatel-Lucent

NASA

Bell Labs

Which of the following statements best describes ARPANET?

ARPANET was an early packet switched network initially connecting 4 sites (Stanford, UC Santa Barbara, UCLA, and U of Utah)

The mission of ARPANET was to connect packet switched networks and other diverse networks, making an international network of networks

ARPANET connected sites spread around the Hawaiian Islands to a central time-sharing computer on the University of Hawaii campus

ARPANET was based on the use of TCP/IP to interconnect diverse systems

Kahn solved the problem of interconnecting different networks using different protocols by pioneering a new protocol called TCP that was capable of:

Secure transmission of information

Enforcing a constant packet size to avoid discards

Allowing remote logins

Providing host to host connectivity with global addressing

Which network was created to replace ARPANET?

INWG

ALOHANET

IETF

NSFNET

Which statement best describes how the internet evolved?

The internet emerged in the commercial world in the 1980s following the US militarys adoption of TCP/IP in 1983

The internet evolved from a military to a research to a commercial based network

The internet remained primarily a research based network and was only commercially adopted in 2000 when the world wide web was conceived

Internet service providers provided the services necessary for military based networks to evolve into research and education based networks

Which organization eventually became the standards body for IP and related protocols?

IEEE

IETF

ITU-T

APNIC

What is the name for an organization that provides Internet services to its customers

A large corporation

An ISP

A home based business

A content provider

The IANA is responsible for:

Intra-city ISP traffic

Allocation of the global IP address space

Allocating IP addresses for residential customer traffic

Allocating North American IP addresses

Which of the following is an important advantage of protocol layering?(Choose two)

Controls distribution of IP addresses

Simplifies protocol functionality

Isolates changes in lower layers from upper layers

Increases protocol operational efficiencies

Layering adds to the fragmentation of the data

To transmit its segments of data across the network TCP uses the services of which layer

Application Layer

Transport Layer

IP Layer

Data Link Layer

Which of the following statements is TRUE regarding the development of the OSI Reference Model?

OSPF

BGP

X.500

IS-IS

Ethernet

Which of the following statements is TRUE regarding the development of the OSI Reference Model?

OSI was developed as an alternative, open standard to IBMs SNA model

OSI protocols were no longer used after TCP/IP was developed

OSI model is much simpler than TCP/IP

OSI model is maintained exclusively by the IETF

The TCP/IP and OSI models of protocol are similar in that they both have:

An application and session layer

A network layer that provides a universal and consistent forwarding service

A transport layer with two protocols

An applications services layer with similar layering and service definitions

How many of the front access card slots of the Alcatel-Lucent 7750 SR-12 router are dedicated for redundant common equipment?

1

2

7

10

Which of the following is not supported on the Alcatel-Lucent 7450 ESS?

Support for IPv6

Support for POS

Upgrade path to the Alcatel-Lucent 7750 SR

Support for IS-IS

The TiMOS-m.n.Y.Z software image file is software that:

Contains all the components required to configure and run protocols on the Alcatel-Lucent 7750 SR/7450 ESS

Loads the router configuration

Transfers the router configuration from the router to the network management system

Loads the router software image

When entering a command on the Alcatel-Lucent 7750 SR from the Command Line Interface (CLI), what would you use to list all the options for the command?

?

tab character

space character

info

Which of the following describes the Alcatel-Lucent 7750 SR Input/Output Module (IOM)?

Small optical module available in a variety of formats

Contains a CPU for managing the forwarding hardware in each flexible fast path

Converts traffic from an external standard format to an internal format

Contains the CPU that runs the routing protocol software as well as the switch fabric

A typical Alcatel-Lucent 7750 SR Media Dependent Adapter (MDA) interfaces with:

A Small Form-Factor Pluggable (SFP) module

The Central Processing Unit (CPU)

The Control Plane

The Switch Fabric

Which of the following best describes the operation of the Media Dependent Adapter (MDA)?

The MDA contains the flexible fast path complex used for forwarding data

Excess data is discarded by the MDA and the remaining data forwarded for QoS processing

The MDA buffers data and applies Quality of Service (QoS) to classify and treat the data appropriately

The MDA converts data from its incoming physical format into an internal format and provides some minimal buffering

What is NOT a function of the IOM?

It forwards the data to the switch fabric

It discards excess data packets

It converts the incoming data to an internal format

It performs Quality of Service operations and buffers incoming data

Which compact flash on a Control/Switch processor of an Alcatel-Lucent 7750 router stores the runtime image and running configuration?

CF 1

CF 2

CF 3

Both A and B

One of the tasks of the boot options file (BOF) is to:

Specify authorization information to control access to the router

Define an IP address for the CPM Ethernet port

Initialize the hardware

Set the date/time for the system

Which of the following user interface sessions are accessible through Telnet and Secure Shell (SSH) on the Alcatel-Lucent 7750 SR and 7450 ESS?

Graphic User Interface (GUI)

Node Management Terminal Interface (NMTI)

Command Line Interface (CLI)

All of the above

You are working from a particular Command Line Interface (CLI) context, and want to see the commands available from your current context. What command can you issue to view this information?

view tree

tree

info detail

info

What is available for auto completion of commands within the CLI on the Alcatel-Lucent 7750 SR Service Router?

Type the first letters of the command, then press Ctrl C

Type the first letters of the command, then press Esc

Type the first letters of the command, then press Tab

Type the first letters of the command, then type ?

Which of the following is a File command in the File System context of the Command Line Interface (CLI)?

time-display

help

type

terminal

What must occur for a LAG to become operational?

There must be multiple ports assigned to the LAG

All ports in the LAG must be configured with the same characteristics

Auto-negotiation must be enabled on all ports in the LAG

All of the above

If a 4-port LAG is configured with the option of port-threshold 2 and action down what will happen if the total operational links in the LAG is 2?

If dynamic-cost is enabled it will adjust the cost for routing protocols such as OSPF

If dynamic-cost is not enabled it will adjust the cost for routing protocols such as OSPF by dividing the link bandwidth by 2

The LAG will be changed to an operational state of down

The LAG will function with only 2 ports. There will be no change to the routing metric

As described by the CSMA/CD algorithm, what is the first thing to happen when Host A and Host B begin transmitting data at the same time?

Host A and B will generate a jam signal

Listening hosts will request retransmission

Host A or B will retry the transmission

A back-off timer is started by Host A or B

What problems was Spanning Tree Protocol (STP) primarily designed to solve?(Choose two):

Providing path redundancy

Preventing loops

Handling collisions

Allowing flooding of multicast traffic

NRS-1

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