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REDES (Cisco) > Final > Flashcards

Final Flashcards

1
Q

What is a characteristic of a fault tolerant network?

A

A network that recovers quickly when a failure occurs and depends on redundancy to limit the impact of a failure

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2
Q

Three bank employees are using the corporate network. The first employee uses a web browser to view a company web page in order to read some announcements. The second employee accesses the corporate database to perform some financial transactions. The third employee participates in an important live audio conference with other corporate managers in branch offices. If QoS is implemented on this network, what will be the priorities from highest to lowest of the different data types?

A

Audio conference, financial transactions, web page*

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3
Q

What is a benefit of using cloud computing in networking?

A

Network capabilities are extended without requiring investment in new infrastructure, personnel, or software.

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4
Q

What is the function of the shell in an OS?

A

It interfaces between the users and the kernel.

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5
Q

Which connection provides a secure CLI session with encryption to a Cisco switch?

A

an SSH connection

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6
Q

A network technician is attempting to configure an interface by entering the following command: SanJose(config)# ip address 192.168.2.1 255.255.255.0. The command is rejected by the device. What is the reason for this?

A

The command is being entered from the wrong mode of operation.

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7
Q

An administrator uses the Ctrl-Shift-6 key combination on a switch after issuing the ping command. What is the purpose of using these keystrokes?

A

to interrupt the ping process

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8
Q

On which switch interface would an administrator configure an IP address so that the switch can be managed remotely?

A

VLAN 1

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9
Q

What protocol is responsible for controlling the size of segments and the rate at which segments are exchanged between a web client and a web server?

A

TCP

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10
Q

What is an advantage to using a protocol that is defined by an open standard?

A

It encourages competition and promotes choices.

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11
Q

What are two benefits of using a layered network model?

A

It assists in protocol design.

It prevents technology in one layer from affecting other layers.

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12
Q

Which two OSI model layers have the same functionality as two layers of the TCP/IP model?

A

Network, Transport

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13
Q

Which name is assigned to the transport layer PDU

A

Segment

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14
Q

A network administrator is troubleshooting connectivity issues on a server. Using a tester, the administrator notices that the signals generated by the server NIC are distorted and not usable. In which layer of the OSI model is the error categorized?

A

physical layer

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15
Q

Which type of UTP cable is used to connect a PC to a switch port?

A

straight-through

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16
Q

What is a characteristic of UTP cabling?

A

cancellation

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17
Q

What are two characteristics of fiber-optic cable?

A

It is not affected by EMI or RFI.

It is more expensive than UTP cabling is

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18
Q

What is a characteristic of the LLC sublayer?

A

It places information in the frame allowing multiple Layer 3 protocols to use the same network interface and media.

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19
Q

A network team is comparing physical WAN topologies for connecting remote sites to a headquarters building. Which topology provides high availability and connects some, but not all, remote sites?

A

partial mesh

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20
Q

What method is used to manage contention-based access on a wireless network?

A

CSMA/CA

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21
Q

What will a host on an Ethernet network do if it receives a frame with a destination MAC address that does not match its own MAC address?

A

It will discard the frame.

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22
Q

What are two examples of the cut-through switching method?

A

fast-forward switching

fragment-free switching

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23
Q

Which frame forwarding method receives the entire frame and performs a CRC check to detect errors before forwarding the frame?

A

store-and-forward switching

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24
Q

What addresses are mapped by ARP?

A

destination MAC address to a destination IPv4 address

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25
Q

What information is added during encapsulation at OSI Layer 3?

A

source and destination IP address

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26
Q

What are two services provided by the OSI network layer?

A

routing packets toward the destination, encapsulating PDUs from the transport layer

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27
Q

Why does a Layer 3 device perform the ANDing process on a destination IP address and subnet mask?

A

to identify the network address of the destination network

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28
Q

What are two functions of NVRAM?

A

to retain contents when power is removed

to store the startup configuration file

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29
Q

What are the three ranges of IP addresses that are reserved for internal private use?

A

10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16

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30
Q

What purpose does NAT64 serve in IPv6?

A

It converts IPv6 packets into IPv4 packets.

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31
Q

Which range of link-local addresses can be assigned to an IPv6-enabled interface?

A

FE80::/10

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32
Q

Which three addresses are valid public addresses?

A

198.133.219.17, 128.107.12.117, 64.104.78.227

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33
Q

What type of IPv6 address is FE80::1?

A

Link local

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34
Q

How many valid host addresses are available on an IPv4 subnet that is configured with a /26 mask?

A

62

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35
Q

A site administrator has been told that a particular network at the site must accommodate 126 hosts. Which subnet mask would be used that contains the required number of host bits?

A

255.255.255.128

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36
Q

How many hosts are addressable on a network that has a mask of 255.255.255.248?

A

6

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37
Q

Which subnet would include the address 192.168.1.96 as a usable host address?

A

192.168.1.64/26

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38
Q

What are two characteristics shared by TCP and UDP?

A

port numbering

use of checksum

39
Q

Why are port numbers included in the TCP header of a segment?

A

to enable a receiving host to forward the data to the appropriate application

40
Q

Which statement is true about variable-length subnet masking?

A

The size of each subnet may be different, depending on requirements

41
Q

In what two situations would UDP be the preferred transport protocol over TCP?

A

when a faster delivery mechanism is needed

when applications do not need to guarantee delivery of the data

42
Q

What important information is added to the TCP/IP transport layer header to ensure communication and connectivity with a remote network device?

A

destination and source port numbers

43
Q

What is the TCP mechanism used in congestion avoidance?

A

sliding window

44
Q

Which scenario describes a function provided by the transport layer?

A

A student has two web browser windows open in order to access two web sites. The transport layer ensures the correct web page is delivered to the correct browser window

45
Q

A user opens three browsers on the same PC to access www.cisco.com to search for certification course information. The Cisco web server sends a datagram as a reply to the request from one of the web browsers. Which information is used by the TCP/IP protocol stack in the PC to identify which of the three web browsers should receive the reply?

A

the destination port number

46
Q

What are two ways that TCP uses the sequence numbers in a segment?

A

compression

encryption

47
Q

Which three statements characterize UDP?

A

UDP provides basic connectionless transport layer functions.
UDP relies on application layer protocols for error detection.
UDP is a low overhead protocol that does not provide sequencing or flow control mechanisms.

48
Q

What is a key characteristic of the peer-to-peer networking model?

A

resource sharing without a dedicated server

49
Q

A technician can ping the IP address of the web server of a remote company but cannot successfully ping the URL address of the same web server. Which software utility can the technician use to diagnose the problem?

A

nslookup

50
Q

Which domain name would be an example of a top-level domain?

A

.com

51
Q

When planning for network growth, where in the network should packet captures take place to assess network traffic?

A

on as many different network segments as possible*

52
Q

A wireless host needs to request an IP address. What protocol would be used to process the request?

A

DHCP

53
Q

Which example of malicious code would be classified as a Trojan horse?

A

malware that was written to look like a video game

54
Q

When applied to a router, which command would help mitigate brute-force password attacks against the router?

A

login block-for 60 attempts 5 within 60

55
Q

A network technician suspects that a particular network connection between two Cisco switches is having a duplex mismatch. Which command would the technician use to see the Layer 1 and Layer 2 details of a switch port?

A

show interfaces

56
Q

Where are Cisco IOS debug output messages sent by default?

A

console line

57
Q

A company is expanding its business to other countries. All branch offices must remain connected to corporate headquarters at all times. Which network technology is required to support this requirement?

A

WAN*

58
Q

A home user is looking for an ISP connection that provides high speed digital transmission over regular phone lines. What ISP connection type should be used?

A

DSL*

59
Q

How does quality of service help a network support a wide range of applications and services?

A

by providing mechanisms to manage congested network traffic*

60
Q

What source IP address does a router use by default when the traceroute command is issued?

A

the IP address of the outbound interface*

61
Q

After making configuration changes on a Cisco switch, a network administrator issues a copy running-config startup-config command. What is the result of issuing this command?

A

The new configuration will be loaded if the switch is restarted.

62
Q

Which connection provides a secure CLI session with encryption to a Cisco network device?

A

an SSH connection

63
Q

What function does pressing the Tab key have when entering a command in IOS?

A

It completes the remainder of a partially typed word in a command.

64
Q

What layer is responsible for routing messages through an internetwork in the TCP/IP model?

A

Internet

65
Q

Which statement accurately describes a TCP/IP encapsulation process when a PC is sending data to the network?

A

Segments are sent from the transport layer to the internet layer

66
Q

What unique address is embedded in an Ethernet NIC and used for communication on an Ethernet network?

A

MAC address

67
Q

Which procedure is used to reduce the effect of crosstalk in copper cables?

A

twisting opposing circuit wire pairs together

68
Q

During the encapsulation process, what occurs at the data link layer for a PC connected to an Ethernet network?

A

The physical address is added.

69
Q

What are two characteristics of Ethernet MAC addresses?

A

They are globally unique

They are expressed as 12 hexadecimal digits.

70
Q

If a device receives an Ethernet frame of 60 bytes, what will it do?

A

drop the frame

71
Q

Which switching method has the lowest level of latency?

A

fast-forward

72
Q

Which two commands can be used on a Windows host to display the routing table?

A

route print, netstat -r

73
Q

Which two functions are primary functions of a router?

A

packet fordwarding, path selection

74
Q

At a minimum, which address is required on IPv6-enabled interfaces?

A

link-local

75
Q

Which service provides dynamic global IPv6 addressing to end devices without using a server that keeps a record of available IPv6 addresses?

A

SLAAC

76
Q

What is the purpose of the command ping ::1?

A

It tests the internal configuration of an IPv6 host.*

77
Q

How many usable IP addresses are available on the 192.168.1.0/27 network?

A

30*

78
Q

What is the process of dividing a data stream into smaller pieces before transmission?

A

segmentation

79
Q

When IPv4 addressing is manually configured on a web server, which property of the IPv4 configuration identifies the network and host portion for an IPv4 address?

A

subnet mask

80
Q

Which two roles can a computer assume in a peer-to-peer network where a file is being shared between two computers?

A

client, server

81
Q

Which two protocols operate at the highest layer of the TCP/IP protocol stack?

A

DNS, POP

82
Q

What is one difference between the client-server and peer-to-peer network models?

A

Every device in a peer-to-peer network can function as a client or a server.*

83
Q

What is the function of the HTTP GET message?

A

to request an HTML page from a web server*

84
Q

Which networking model is being used when an author uploads one chapter document to a file server of a book publisher?

A

client/server

85
Q

What network service resolves the URL entered on a PC to the IP address of the destination server?

A

DNS

86
Q

A network engineer is analyzing reports from a recently performed network baseline. Which situation would depict a possible latency issue?

A

an increase in host-to-host ping response times

87
Q

Which firewall feature is used to ensure that packets coming into a network are legitimate responses to requests initiated from internal hosts?

A

stateful packet inspection

88
Q

Which command can an administrator issue on a Cisco router to send debug messages to the vty lines?

A

terminal monitor

89
Q

Fill in the blank.
During data communications, a host may need to send a single message to a specific group of destination hosts simultaneously. This message is in the form of a ________ message.

A

Multicast

90
Q

A medium-sized business is researching available options for connecting to the Internet. The company is looking for a high speed option with dedicated, symmetric access. Which connection type should the company choose?

A

leased line

91
Q

What is the purpose of having a converged network?

A

to reduce the cost of deploying and maintaining the communication infrastructure

92
Q

What characteristic of a network enables it to quickly grow to support new users and applications without impacting the performance of the service being delivered to existing users?

A

scalability

93
Q

After several configuration changes are made to a router, the copy running-configuration startup-configuration command is issued. Where will the changes be stored?

A

NVRAM

94
Q

In computer communication, what is the purpose of message encoding?

A

to convert information to the appropriate form for transmission*

REDES (Cisco) (1 decks)

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