Lernkartei NRS-1 (Seite 2 von 6)

Karten	215
Lernende	11
Sprache	English
Kategorie	Informatik
Stufe	Andere
Erstellt / Aktualisiert	01.05.2013 / 04.01.2019
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What happens immediately after an Ethernet switch receives an Ethernet frame?

It records the destination MAC address and the interface on which it arrived

It records the source MAC address and the interface on which it arrived

It floods the frame out of all its interfaces except the interface on which the frame arrived

It transmits the frame out of the appropriate interface

In what type of network is a broadcast storm likely to occur?

An Ethernet network with redundant paths not running STP

An ATM network

A SONET network

All of the above

What is the behaviour of a typical Ethernet switch when it receives a frame with a unicast destination MAC address?(Choose two)

The switch floods the frame out of all ports except the port on which it was received

The switch looks in its FDB. If the source address is unknown it discards the frame

The switch looks in its FDB. If the destination address is known it forwards the frame out the appropriate interface

The switch looks in its FDB. If the destination address is unknown it floods the frame out all ports except the port on which it was received

The switch looks in its FDB. If the destination address is unknown it discards the frame

A 24 port Ethernet switch is configured with VLAN 100 on ports 1 - 8, VLAN 200 on ports 9 - 16 and VLAN 300 on ports 17 _ 24. Which of the following describes the behavior of the switch when a broadcast frame is received on port 1?

The switch will discard the broadcast frame because there is no specific destination address

The switch will flood the broadcast frame on all ports on which the switch has seen frames from attached devices

The switch will flood the broadcast frame on ports 2 to 8

The switch will flood the broadcast frame on all 24 ports

Which of the following best describes an Ethernet bridge?

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 other 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

The method by which Ethernet frames are associated to a specific VLAN is referred to as:

Segmenting

Stacking

Routing

Tagging

Which technologies can be used with Ethernet switches to achieve redundancy?(Choose two)

LAG

OSPF

RIP

STP

What is required if devices on different VLANs wish to communicate with each other?

Devices on different VLANs cannot communicate with each other

Devices on different VLANs can communicate with each other as long as they are connected to the same switch

Devices on different VLANs can communicate with each other as long as the switches they are attached to are connected to each other with an Ethernet connection

Devices on different VLANs can communicate with each other if there is an IP router to connect the VLANs

Which of the following is a feature of a VLAN?

A VLAN allows multiple Ethernet switches to be connected in a single broadcast domain

A VLAN allows multiple Ethernet switches to be connected in a single collision domain

A VLAN can separate ports on the same switch into different broadcast domains

A VLAN can separate ports on the same switch into different collision domains

What information is used to separate VLANs on a VLAN trunk that connects multiple VLANs?

VLAN tag

IP Header

FCS

Priority Value

Using Q-in-Q Virtual Local Area Network (VLAN) stacking, how does a carrier differentiate one customers traffic from that of another?

The provider edge (PE) switch adds an additional field called a PE tag to the customers Layer 2 data

The PE switch replaces the customers VLAN tag with a carrier-assigned tag

The PE switch adds a second VLAN tag to identify the customers traffic on the carriers network

The PE switch assigns a customer-specific priority label to the customers traffic

What is the purpose of the Data Link Layer in the OSI model?

The Data Link Layer is responsible for encapsulating the packet into a frame for transmission on the transmission media

The Data Link Layer is responsible for encapsulating the packet into an IP header and routing the packet

The Data Link Layer is responsible for formatting the packet for applications such as JPEG format

The Data Link Layer is responsible for timing of the signals on the transmission media

Which of the following is typically a characteristic of Layer 2 framing?

Provides a universal addressing scheme to uniquely identify destinations in the network

The size of the Layer 2 frame cannot exceed 1518 bytes

Provides error checking of the frame contents after transmission

All the above

Which of the following is NOT an example of a Layer 2 protocol?

POS

IP

ATM

Frame Relay

Ethernet

Why is the address field in a PPP header always set to "11111111"?

PPP supports multipoint access networks with many stations. The all 1 s acts as a broadcast

PPP supports multipoint access networks with many stations. The all 1 s acts as a multicast

PPP supports point-to-point networks only. The address field is fixed

PPP supports point-to-point networks only. The address field can change dynamically since every station is assigned a PPP address

Which ATM adaptation layer is commonly used for transporting IP datagrams or non-real time data?

AAL0

AAL1

AAL2

AAL3/4

AAL5

Which of the following is a characteristic of ATM?

Application data is transported in 53-byte cells

ATM circuits are identified by a VPI/VCI value

Provides enhanced QoS support with 5 classes of service

Ideal for multiple services on the same physical line

All of the above

What is the basic unit of framing in SONET and the bit rate for its transmission?

STS-1 with a bit rate of 1544 Mbit/s

STS-1 with a bit rate of 2048 Mbit/s

STS-1 with a bit rate of 5184 Mbit/s

STS-1 with a bit rate of 15552 Mbit/s

What is the basic unit of framing in SDH and the bit rate for its transmission?

STM-1 with a bit rate of 1544 Mbit/s

STM-1 with a bit rate of 2048 Mbit/s

STM-1 with a bit rate of 5184 Mbit/s

STM-1 with a bit rate of 15552 Mbit/s

Which of the following are examples of Time Division Multiplexing (Choose two)?

Ethernet

Token-Ring

SONET/SDH

E1 carrier

PPP

How many DS-3 frames can be transported in an OC-3 frame?

1

2

3

4

Who was responsible for developing and publishing the original standard that was used for 10 Mbit/s Ethernet?

Intel Corporation

Digital Equipment Corporation

DEC-Intel-Xerox

Apple Computer

IBM

Which Ethernet frame field does the receiver use to verify the integrity of the received bits?

Destination address

Frame check sequence

Preamble

Length field

How is Ethernet II different from Ethernet 8023?

Ethernet 8023 can only be used on point-to-point links, while Ethernet II can be used on broadcast networks

In Ethernet II the 2 bytes after the source MAC address is used as a type indicator. In Ethernet 8023 these two bytes indicate the length of the frame

In Ethernet 8023, the 2 bytes after the source MAC address is used as a type indicator. In Ethernet II these two bytes indicate the length of the frame

Ethernet II and Ethernet 8023 are two different names for the same protocol

Given the Mac Address 00-20-60-ce-2b:28, which part is the Organizationally Unique Identifier (OUI)?

2b:28

00-20

ce-2b:28

00-20-60

Which of the following type of addressing scheme delivers information from one source to all devices who are members of a specific group?

Anycast

Multicast

Broadcast

Unicast

Which of the following is true of Ethernet half-duplex transmission?

Half-duplex transmission is less efficient because the frame MTU is smaller

Half-duplex transmission is only 30-40% efficient because of collisions

Ethernet switches support half-duplex transmission only

All of the above

What is the meaning of carrier sense in the CSMA/CD algorithm?

The host will retransmit the frame if it detects a collision during transmission

The host is able to detect the transmission speed of the Ethernet switch port to which the host is connected

The host will only transmit data when it detects that no other devices are transmitting

The host will only transmit upon a timer expiry

The host will only transmit when it receives the token

What is the effective maximum rate of data transmission on a 10 Mbps full-duplex Ethernet link?

5 Mbps

10 Mbps

15 Mbps

20 Mbps

Which of the following Ethernet rates requires an optical cable to operate?

10 Mb/s Ethernet

100 Mb/s Ethernet

1000 Mb/s Ethernet

There are copper and optical versions possible for all of these Ethernet data rates

What distance is supported using CAT-5 cabling for 10/100/1000 TX?

100 m

500 m

1 Km

10 Km

Which of the following statements is TRUE of Layer 3 addressing?

Internet devices on the same network can have the same Layer 3 address in different broadcast domains

Every Host device must have a unique Layer 3 address in order to access the Internet

Internet devices need unique Layer 3 addresses to communicate directly with upper layers

A router must have only one address to allow it to be uniquely identified

Which of the following is a characteristic of the IP layer?

Provides an unreliable, connectionless data transmission service

Provides a mechanism for flow control

Verifies the integrity of all received datagrams

Provides services equivalent to the OSI data link layer

The physical networks connecting two PCs to the internet are DSL and PPP respectively. Which layer will enable the two PCs to communicate?

Layer 1

Layer 2

Layer 3

Layer 4

Hosts in the same IP network share which common address feature?

Same host numbers

Same IP address

First two bits of the IP address are set to 01

Same network prefix

A Class C network is defined by a:

32-bit network prefix

24-bit network prefix

16-bit network

8-bit network

Public IP address spaces are distributed by which of the following organizations?

Network Solutions INC

IANA

IETF

ITU-T

IEEE

What characteristic of IP addressing creates a hierarchical network?

All hosts on all networks must have unique host numbers

IP addresses identify a host and the network on which it resides

Clients are assigned 32-bit addresses and servers 64-bit addresses

Router, switch and host addresses are drawn from unique address classes

Which of the following is a private IP network address reserved by the IANA?

1723000/16

19210000/24

172000/16

16925400/16

11000/8

Which type of IP address contains the network number and all 1 s for the host address?

Unicast address

Broadcast address

Multicast address

Anycast address

NRS-1

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