Cartes mémoires NRS-1 (Seite 3 von 6)

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Langue	English
Catégorie	Informatique
Niveau	Autres
Crée / Actualisé	01.05.2013 / 04.01.2019
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What bit pattern identifies the network address in the subnet mask?

A string of 1s

A string of 0s

A string of alternating 10s

There is no specific bit pattern to identify the network address

Complete the following sentence: The introduction of the subnet address added another

Layer of hierarchy in the addressing structure

Class to the classful addressing system

16-bit number to accompany the IP address

4,294,967,296 addresses to the IP address space

Network address: 20012300 Network mask: 2552552550 Use the information above. You need to create 12 subnetworks supporting 10 host addresses each. Which extended prefix will meet this requirement?

/12

/24

/26

/28

/30

Given the associated prefix value, which of the following is a valid host address?

17216224255/18

255255255255/32

224121/8

1921682459/30

What is the purpose of the broadcast address?

Provides an address that refers to all the devices in a given network

Provides an address to refer to a specific group of devices in a given network

Provides an address to refer to a group of devices having the same IP addresses in different Layer 2 networks

Provides an address to refer to a single device on a given network

Which three of the following are important considerations when designing subnets? (Choose three)

Number of subnetworks currently required

Type of physical connectivity used by each segment

Future network growth requirements

Number of hosts each subnetwork will support

Class of the network address to be used for the network

With a subnet mask of 255255255224, which of the IP addresses below are valid host addresses? (Choose all that apply)

172311963

879912159

95112293

192112587

Given a network address of 1161400, which of the following is a valid host address when using the subnet mask 255255255240?

116141716

116141731

1161417192

1161417189

Given the following (Network address: 208402240, Network prefix: /28) What is the address range, including the network and broadcast addresses, for the fourth sub-network?

208402240 20840224255

2084040 208404255

2084022416 2084022431

2084022448 2084022463

208402270 - 20840224255

Which of the following is a characteristic of a subnet created with a /31 prefix?

There is no broadcast address on the network

The address can only be used as a loopback address

This specifies a single host address

A /31 prefix is not supported on the SR and ESS platform

Which of the following is a characteristic of the system address?

A physical interface address

A logical address on the router not corresponding to any specific interface

May have any prefix value

A management IP address

Address summarization reduces the routing table size by:

Allowing a contiguous block of network addresses to be represented by one network prefix

Increasing the number of addresses in the routing table

Summarizing addresses in the network into smaller routing tables

Not advertising directly connected routes

What is the preference value in the routing table used for?

It indicates the preferred egress interface

It differentiates between multiple routes to a destination learned by the same protocol

It differentiates between multiple routes to a destination learned by different routing protocols

It is used to differentiate local routes from remote routes

At what stage in the packet forwarding process is the IP packet header examined?

When the router first receives a frame from a LAN

After the forwarding table is checked

After the IP datagram is extracted from the L2 frame

Immediately before the IP packet is encapsulated for transmission

What happens next after an incoming packet is de-encapsulated from the Layer 2 frame in an Alcatel-Lucent 7750 router?

The IP datagram is encapsulated in the appropriate Layer 2 frame by the MDA

The IP datagram passes through the switch fabric to reach the egress IOM

The IP datagram is passed to the IOM

A lookup is performed in the FIB to determine the egress interface

Which of the following describes an IP filter on the Alcatel-Lucent 7750 SR?

An IP filter is used to examine an IP packet and its contents

An IP filter is applied to allow or deny IP packets into a network

Multiple ingress and egress filter policies can be applied to a network interface

Once an IP filter is applied it cannot be modified

Which of the following is a characteristic of Port Address Translation?

Resolves a Mac address given a specific IP address

Allows a single public IP address to represent multiple private IP addresses simultaneously

Maps a private address to a well known port number

Provides a one to one mapping from a private to a public address

What is the sequence of messages sent by a host when it attempts to ping a destination for which it has no Address Resolution Protocol (ARP) cache entry?

ICMP echo request, ARP request, ARP reply, ICMP echo reply

ARP request, ARP reply, ICMP echo request, ICMP echo reply

ICMP echo request, ICMP echo reply, ARP request, ARP reply

ICMP echo request, ARP reply, ARP request, ICMP echo reply

What is the main purpose of IP fragmentation?

To limit the number of the IP addresses in the network

To improve the efficiency of transmissions over the network

To reduce the number of resources required to send a large frame over the network

To allow IP datagrams to be carried over Layer 2 networks with varying MTU sizes

Which of the following best describes the function of an ARP cache within the same subnet?

Used by IP to map an unknown IP address to the known hardware address of the distant host

Adds only an IP address entry for an unknown device on the same subnet

Transmits ICMP messages to multiple hosts with unknown IP addresses

Resolves the MAC address of a host device given its IP address

Which of the following IP header fields contains information that indicates whether routers are allowed to fragment a packet?

Header checksum

Fragmentation offset

Flags

Identification

Which of the following statements is TRUE about ICMP?

An IP datagram is encapsulated within an ICMP header

ICMP messages can only be generated by routers

ICMP messages are encapsulated within an IP datagram

ICMP guarantees delivery of a message

When a device in an IP network receives an echo request message that is destined for itself, it then:

Estimates the round trip-time

Generates an echo reply

Calculates the data loss statistics

Verifies the data field of the message

What ICMP message type will a router use to indicate to a host that an IP datagram sourced from that host cannot be delivered?

Echo Request

Destination Unreachable

Router redirect

Echo Reply

What is the sequence of events for a client to receive an IP address from the server in the DHCP?

Discover, offer, request, acknowledgement

Request, offer, discover, acknowledgement

Discover, request, offer, acknowledgement

Request, acknowledgement, discover, offer

Which of the following command lines would be found in a list of commands designed to permit only certain type of traffic from exiting router RTR-A to router RTR-B?

RTR-A>config>router>if>ingress# filter ip 1

RTR-B>config>router>if>ingress# filter ip 1

RTR-A>config>router>if>egress# filter ip 1

What protocol is used by ping to verify IP network reachability?

DCHP

ICMP

ARP

NAT

A set of tasks that move a packet from its entry into an IP network to its exit from the IP network. This describes:

IP routing

IP protocol

IP encapsulation

IP tunneling

Which field in the IP routing table contains the name or address of the neighbour that advertised the prefix to the router?

Preference

Metric

Dest prefix

Next hop

What is the function of the Routing Table Manager?

Based on the metrics of the routing protocol, find the best path to the destination network and install it in the routing table

Provide a CLI interface to allow the operator to configure the dynamic routing protocol on the router

Based on the routing protocol preference values, chose the route with the lowest preference and install it in the routing table

Provide a CLI interface to allow the network operator to install static routes in the routing table

Which of the following is characteristic of a static route?

Responds in real time to network failures

Can only be used for routing within an autonomous system

Uses a hop-count metric to determine the best route to a network

Explicitly defines the next hop based on operator input

Which of the following describes a static default route?

An entry included in the default configuration of the router that is used if no dynamic routing protocols or static routes are configured

A wildcard entry used when the destination network is not specifically defined in the routing table

An entry selected based on the route that has the least cost to the destination (path with the most physical bandwidth)Ê

An entry used by the routing protocol when it is unable to calculate the best route to the destination

What are the tasks of the Routing Table Manager (RTM)? Choose twoÊ

RTM selects the best route from among multiple routing protocols

RTM selects the best route using the metric as criteria

RTM sends its best route to all its directly connected neighbors

RTM installs its best route in the routing table

Choose two true statements that characterize Distance Vector 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

What metric does a link state protocol use to choose the best path to a destination network?

Link bandwidth

Round trip time

Hop count

Route preference

You need to implement an interior gateway routing protocol for your network that supports scalability, fast convergence and VLSM. Which routing protocol would best serve your needs?

RIPv1

RIPv2

OSPF

BGP

Static routes

Which of the parameters in Hello messages exchanged between two OSPF neighbors must be the same to keep the adjacency alive in OSPF? (Choose four)

Interface MTU

Area ID

Authentication password

Hello interval

Dead interval

Which of the following are TRUE statements about the router ID in OSPF? Choose two

A router ID is not required by OSPF

The system address is used as the router ID if router-id is not set

The router ID is used to uniquely identify every OSPF router

On the Alcatel-Lucent 7750 SR, the router ID is set to the highest logical IP address if router-id is not explicitly set

Which of the following are FALSE statements about the OSPF routing protocol? Choose two

OSPF is a link state protocol with fast convergence

OSPF supports hierarchy with multiple areas

The default metric for OSPF is hop count

OSPF does not support VLSM

OSPF supports neighbor authentication

Which of the following describes the normal sequence of events in the forming of an OSPF adjacency?

Hello exchange, DB descriptor exchange, Link state requests and updates

DB descriptor exchange, Link state requests and updates, Hello exchange

Link state requests and updates, Hello exchange, DB descriptor exchange

Hello exchange, Link state requests and updates, DB descriptor exchange

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