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1/13 Szoftverfejlesztés > Network essentials 3 > Flashcards

Network essentials 3 Flashcards

1
Q

Which information is used by routers to forward a data packet toward its destination?

A

destination IP address

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2
Q

A computer has to send a packet to a destination host in the same LAN. How will the packet be sent?

A

The packet will be sent directly to the destination host.

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3
Q

A router receives a packet from the Gigabit 0/0 interface and determines that the packet needs to be forwarded out the Gigabit 0/1 interface. What will the router do next?

A

create a new Layer 2 Ethernet frame to be sent to the destination

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4
Q

Which IPv4 address can a host use to ping the loopback interface?

A

127.0.0.1

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5
Q

A computer can access devices on the same network but cannot access devices on other networks. What is the probable cause of this problem?

A

The computer has an invalid default gateway address.

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6
Q

Which statement describes a feature of the IP protocol?

A

IP relies on upper layer services to handle situations of missing or out-of-order packets.

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7
Q

Why is NAT not needed in IPv6?​

A

Any host or user can get a public IPv6 network address because the number of available IPv6 addresses is extremely large.

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8
Q

Which parameter does the router use to choose the path to the destination when there are multiple routes available?

A

the lower metric value that is associated with the destination network

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9
Q

What are two services provided by the OSI network layer? (Choose two.)

A

routing packets toward the destination

encapsulating PDUs from the transport layer

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10
Q

Within a production network, what is the purpose of configuring a switch with a default gateway address?

A

The default gateway address is used to forward packets originating from the switch to remote networks.

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11
Q

What is a basic characteristic of the IP protocol?

A

connectionless

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12
Q

Which field in the IPv4 header is used to prevent a packet from traversing a network endlessly?

A

Time-to-Live

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13
Q

What is one advantage that the IPv6 simplified header offers over IPv4?

A

efficient packet handling

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14
Q

What IPv4 header field identifies the upper layer protocol carried in the packet?

A

Protocol

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15
Q

What information does the loopback test provide?

A

The TCP/IP stack on the device is working correctly.

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16
Q

What routing table entry has a next hop address associated with a destination network?

A

remote routes

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17
Q

How do hosts ensure that their packets are directed to the correct network destination?

A

They have to keep their own local routing table that contains a route to the loopback interface, a local network route, and a remote default route.

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18
Q

When transporting data from real-time applications, such as streaming audio and video, which field in the IPv6 header can be used to inform the routers and switches to maintain the same path for the packets in the same conversation?

A

Flow Label

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19
Q

What statement describes the function of the Address Resolution Protocol?

A

ARP is used to discover the MAC address of any host on the local network.

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20
Q

Under which two circumstances will a switch flood a frame out of every port except the port that the frame was received on? (Choose two.)

A

The frame has the broadcast address as the destination address.

The destination address is unknown to the switch.

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21
Q

Which statement describes the treatment of ARP requests on the local link?

A

They are received and processed by every device on the local network.

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22
Q

Which destination address is used in an ARP request frame?

A

FFFF.FFFF.FFFF

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23
Q

A network technician issues the arp -d * command on a PC after the router that is connected to the LAN is reconfigured. What is the result after this command is issued?

A

The ARP cache is cleared.

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24
Q

Which two types of IPv6 messages are used in place of ARP for address resolution?

A

neighbor solicitation

neighbor advertisement

25
Q

What is the aim of an ARP spoofing attack?

A

to associate IP addresses to the wrong MAC address

26
Q

Where are IPv4 address to Layer 2 Ethernet address mappings maintained on a host computer?

A

ARP cache

27
Q

What important information is examined in the Ethernet frame header by a Layer 2 device in order to forward the data onward?

A

destination MAC address

28
Q

Match the commands to the correct actions. (Not all options are used.

A

Router(config)#hostname CL1_ configures a name on the router

Router(config-line)#password class: provides security on the console

Router(config)# banner motd #: displays a message when the router is accessed

29
Q

A new network administrator has been asked to enter a banner message on a Cisco device. What is the fastest way a network administrator could test whether the banner is properly configured?

A

Exit privileged EXEC mode and press Enter.

30
Q

A network administrator requires access to manage routers and switches locally and remotely. Match the description to the access method. (Not all options are used.)

A

SSH: remote access method that uses encryption

console: preferred out-of-band access method

AUX: remote access via a dialup connection

Telnet: Unsecure remote access

31
Q

Match the phases to the functions during the boot up process of a Cisco router. (Not all options are used.)

A

Phase 1: perform the POST and load the bootstrap program
Phase 2: locate and load the Cisco IOS software
Phaase 3: locate and load the startuo configuration file

32
Q

Match the command with the device mode at which the command is entered. (Not all options are used.)

A

login: R1(config-line)#

service password encryption: R1(config)#

IP adress 192.168.4.4 255.255.255.0: R1(config-if)#

copy running-config startuo-config: R1#

enable: R1>

33
Q

What are two functions of NVRAM? (Choose two.)

A

to retain contents when power is removed

to store the startup configuration file

34
Q

A router boots and enters setup mode. What is the reason for this?

A

The configuration file is missing from NVRAM.

35
Q

The global configuration command ip default-gateway 172.16.100.1 is applied to a switch. What is the effect of this command?

A

The switch can be remotely managed from a host on another network.

36
Q

What happens when the transport input ssh command is entered on the switch vty lines?

A

Communication between the switch and remote users is encrypted.

37
Q

Which three commands are used to set up secure access to a router through a connection to the console interface? (Choose three.)

A

line console 0

login

password cisco

38
Q

Which two functions are primary functions of a router? (Choose two.)

A

packet forwarding

path selection

39
Q

What is the effect of using the Router# copy running-config startup-config command on a router?

A

The contents of NVRAM will change.

40
Q

What will happen if the default gateway address is incorrectly configured on a host?

A

The host cannot communicate with hosts in other networks.

41
Q

What are two potential network problems that can result from ARP operation? (Choose two.)

A

On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays.

Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic.

42
Q

Which term describes a field in the IPv4 packet header used to identify the next level protocol?

A

protocol

43
Q

Which term describes a field in the IPv4 packet header that contains an 8-bit binary value used to determine the priority of each packet?

A

differentiated services

44
Q

Which term describes a field in the IPv4 packet header that contains a 32-bit binary value associated with an interface on the sending device?

A

source IPv4 address

45
Q

Which term describes a field in the IPv4 packet header used to detect corruption in the IPv4 header?

A

header checksum

46
Q

Which term describes a field in the IPv4 packet header that contains a unicast, multicast, or broadcast address?

A

destination IPv4 address

47
Q

Which term describes a field in the IPv4 packet header used to limit the lifetime of a packet?

A

TTL

48
Q

Which term describes a field in the IPv4 packet header that contains a 4-bit binary value set to 0100?

A

version

49
Q

Which term describes a field in the IPv4 packet header used to identify the next level protocol?

A

protocol

50
Q

Which term describes a field in the IPv4 packet header that contains a 4-bit binary value set to 0100?

A

version

51
Q

What property of ARP causes cached IP-to-MAC mappings to remain in memory longer?

A

Entries in an ARP table are time-stamped and are purged after the timeout expires.

52
Q

What property of ARP allows MAC addresses of frequently used servers to be fixed in the ARP table?

A

A static IP-to-MAC address entry can be entered manually into an ARP table

53
Q

What property of ARP allows hosts on a LAN to send traffic to remote networks?

A

Local hosts learn the MAC address of the default gateway.

54
Q

What property of ARP forces all Ethernet NICs to process an ARP request?

A

The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame.

55
Q

What property of ARP causes a reply only to the source sending an ARP request?

A

The source MAC address appears in the header of the Ethernet frame.

56
Q

What property of ARP causes the request to be flooded out all ports of a switch except for the port receiving the ARP request?

A

The destination MAC address FF-FF-FF-FF-FF-FF appears in the header of the Ethernet frame.

57
Q

What property of ARP causes the NICs receiving an ARP request to pass the data portion of the Ethernet frame to the ARP process?

A

The type field 0x806 appears in the header of the Ethernet frame.

58
Q

What property of ARP causes the NICs receiving an ARP request to pass the data portion of the Ethernet frame to the ARP process?

A

The type field 0x806 appears in the header of the Ethernet frame

1/13 Szoftverfejlesztés (11 decks)

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