final exam Flashcards
(155 cards)
1
Q
A client packet is received by a server. The packet has a destination port number of 143. What is the client requesting?
A
IMAP
2
Q
Which functions are performed at the MAC sub layer of the OSI Data link layer to facilitate Ethernet communications?
A
- implements trailer with frame check sequence for error detection
- applies delimiting of Ethernet frame fields to synchronise communication between nodes.
- implements a process to delimit fields within an Ethernet 2 frame
- responsible for internal structure of Ethernet frame
- implements CSMA/CD over legacy shared half duplex
- integrates Layer 2 flows between 10 Gigabit Ethernet over fibre and 1 Gigabit Ethernet over copper
3
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 mode and press Enter
4
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.
5
Q
What is the subnet ID associated with the IPv6 address 2001:DA48:FC5:A4:3D1B::1/64
A
2001:DA48:FC5:A4::1/64
The /64 represents the network and subnet IPv6 fields. The fourth field of hexadecimal digits is referred to as the subnet ID
6
Q
A client is using SLAAC to obtain an IPv6 address for its interface. After an address has been generated and applied to the interface, what must the client do before it can begin to use this IPv6 address?
A
It must send an ICMPv6 Neighbor Solicitation message to ensure that the address is not already in use on the network.
7
Q
Which range of link-local addresses can be assigned to an IPv6-enabled interface?
A
FE80::/10
8
Q
What mechanism is used by a router to prevent a received IPv4 packet from traveling endlessly on a network?
A
It decrements the value of the TTL field by 1 and if the result is 0, it discards the packet and sends a Time Exceeded message to the source host.
9
Q
A network administrator is designing the layout of a new wireless network. Which three areas of concern should be accounted for when building a wireless network? (Choose three.)
A
security
interference
coverage area
10
Q
A network administrator notices that some newly installed Ethernet cabling is carrying corrupt and distorted data signals. The new cabling was installed in the ceiling close to fluorescent lights and electrical equipment. Which two factors may interfere with the copper cabling and result in signal distortion and data corruption?
A
EMI
RFI
11
Q
Data is being sent from a source PC to a destination server. Which three statements correctly describe the function of TCP or UDP in this situation?
A
- The source port field identifies the running application or service that will handle data returning to the PC.
- UDP segments are encapsulated within IP packets for transport across the network.
- The UDP destination port number identifies the application or service on the server which will handle the data.
12
Q
A group of Windows PCs in a new subnet has been added to an Ethernet network. When testing the connectivity, a technician finds that these PCs can access local network resources but not the Internet resources. To troubleshoot the problem, the technician wants to initially confirm the IP address and DNS configurations on the PCs, and also verify connectivity to the local router. Which three Windows CLI commands and utilities will provide the necessary information?
A
ping
ipconfig
nslookup
13
Q
What two pieces of information are displayed in the output of the show ip interface brief command?
A
IP addresses
Layer 1 statuses
14
Q
A network administrator is adding a new LAN to a branch office. The new LAN must support 25 connected devices. What is the smallest network mask that the network administrator can use for the new network?
A
255.255.255.224
15
Q
Which frame field is created by a source node and used by a destination node to ensure that a transmitted data signal has not been altered by interference, distortion, or signal loss?
A
frame check sequence field
16
Q
What is a function of the data link layer?
A
provides for the exchange of frames over a common local media
17
Q
What are three characteristics of the CSMA/CD process?
A
- A device listens and waits until the media is not busy before transmitting.
- All of the devices on a segment see data that passes on the network medium.
- After detecting a collision, hosts can attempt to resume transmission after a random time delay has expired.
18
Q
What characteristic describes a Trojan horse?
A
malicious software or code running on an end device
19
Q
What three requirements are defined by the protocols used in network communcations to allow message transmission across a network?
A
message encoding
delivery options
message size
20
Q
What are two features of ARP?
A
- If a device receiving an ARP request has the destination IPv4 address, it responds with an ARP reply.
- If a host is ready to send a packet to a local destination device and it has the IP address but not the MAC address of the destination, it generates an ARP broadcast.
21
Q
What are two characteristics of IP
A
does not require a dedicated end-to-end connection
operates independently of the network media
22
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.
23
Q
Users report that the network access is slow. After questioning the employees, the network administrator learned that one employee downloaded a third-party scanning program for the printer. What type of malware might be introduced that causes slow performance of the network?
A
worm
24
Q
A company has a file server that shares a folder named Public. The network security policy specifies that the Public folder is assigned Read-Only rights to anyone who can log into the server while the Edit rights are assigned only to the network admin group. Which component is addressed in the AAA network service framework?
A
authorization
25
What are two common causes of signal degradation when using UTP cabling? (Choose two.)
low-quality cable or connectors
improper termination
26
Which scenario describes a function provided by the transport layer?
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.
27
What is the consequence of configuring a router with the ipv6 unicast-routing global configuration command?
The IPv6 enabled router interfaces begin sending ICMPv6 Router Advertisement messages.
28
Which two protocols operate at the top layer of the TCP/IP protocol suite? (Choose two.)
POP
DNS
29
An employee of a large corporation remotely logs into the company using the appropriate username and password. The employee is attending an important video conference with a customer concerning a large sale. It is important for the video quality to be excellent during the meeting. The employee is unaware that after a successful login, the connection to the company ISP failed. The secondary connection, however, activated within seconds. The disruption was not noticed by the employee or other employees.
What are the network characteristics described in this scenario?
quality of service
fault tolerance
security
30
Which three layers of the OSI model map to the application layer of the TCP/IP model?
application
presentation
session
31
what is the appropriate IP address for link local
169.254.1.5
32
what is the appropriate IP address for TEST-NET
192.0.2.123
33
what is the appropriate IP address for an experimental address
240.2.6.255
34
what is the appropriate IP address for a private address
172.19.20.5
35
what is the appropriate IP address for a loop back address
127.0.0.1
36
What does the term “attenuation” mean in data communication?
loss of signal strength as distance increases
37
Which two statements describe how to assess traffic flow patterns and network traffic types using a protocol analyzer?
- Capture traffic during peak utilization times to get a good representation of the different traffic types.
- Perform the capture on different network segments.
38
Which subnet would include the address 192.168.1.96 as a usable host address?
192.168.1.64/26
39
What are two problems that can be caused by a large number of ARP request and reply messages? (Choose two.)
A large number of ARP request and reply messages may slow down the switching process, leading the switch to make many changes in its MAC table.
The ARP request is sent as a broadcast, and will flood the entire subnet.
40
Why would a Layer 2 switch need an IP address?
to enable the switch to be managed remotely
41
How does the service password-encryption command enhance password security on Cisco routers and switches?
It encrypts passwords that are stored in router or switch configuration files.
42
Which two statements are correct in a comparison of IPv4 and IPv6 packet headers?
The Source Address field name from IPv4 is kept in IPv6.
The Time-to-Live field from IPv4 has been replaced by the Hop Limit field in IPv6.
43
Which two statements accurately describe an advantage or a disadvantage when deploying NAT for IPv4 in a network?
NAT provides a solution to slow down the IPv4 address depletion.
NAT introduces problems for some applications that require end-to-end connectivity.
44
What is typically identified on a physical topology diagram?
Location of a desktop PC in a class room
Path of cables that connect rooms to wiring closets
45
What is typically identified on a logical topology diagram?
Addressing information i.e IP address of a server
46
What service is provided by HTTP?
A basic set of rules for exchanging text, graphic images, sound, video, and other multimedia files on the web.
47
A client packet is received by a server. The packet has a destination port number of 67. What service is the client requesting?
DHCP
48
What are the two most effective ways to defend against malware?
Update the operating system and other application software.
Install and update antivirus software.
49
An administrator defined a local user account with a secret password on router R1 for use with SSH. Which three additional steps are required to configure R1 to accept only encrypted SSH connections?
Configure the IP domain name on the router.
Generate the SSH keys.
Enable inbound vty SSH sessions.
50
A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in its ARP cache. How will the device obtain a destination MAC address?
It will send an ARP request for the MAC address of the default gateway.
51
What is in the header field in OSI Model Layer
2
802.2 header
FCS (Frame Check Sequence)
Destination MAC Address
52
What is in the header field in OSI Model Layer 3
TTL
Source IP address
53
What is in the header field in OSI Model Layer 4
Acknowledgment Number
Destination Port Number
54
When a switch configuration includes a user-defined error threshold on a per-port basis, to which switching method will the switch revert when the error threshold is reached?
store-and-forward
55
What are proprietary protocols?
protocols developed by organizations who have control over their definition and operation
56
What is an advantage to using a protocol that is defined by an open standard?
It encourages competition and promotes choices.
57
Which type of server relies on record types such as A, NS, AAAA, and MX in order to provide services?
DNS
58
Describe peer to peer network
No dedicated server is required
Client and server roles are set on a per request basis
59
Peer to peer application
Requires a specific user interface
A background service is required
60
A network administrator wants to have the same network mask for all networks at a particular small site. The site has the following networks and number of devices:
IP phones – 22 addresses
PCs – 20 addresses needed
Printers – 2 addresses needed
Scanners – 2 addresses needed
The network administrator has deemed that 192.168.10.0/24 is to be the network used at this site. Which single subnet mask would make the most efficient use of the available addresses to use for the four subnetworks?
255.255.255.224
61
What would be the interface ID of an IPv6 enabled interface with a MAC address of 1C-6F-65-C2-BD-F8 when the interface ID is generated by using the EUI-64 process?
1E6F:65FF:FEC2:BDF8
62
Which information does the show startup-config command display?
the contents of the saved configuration file in the NVRAM
63
What is the function of addressing?
This field helps to direct the frame towards its destination.
64
What is the function of error detection?
The field checks of the frame has been damaged during the transfer.
65
What is the function of type?
This field is used by the LLC to identify the Layer 3 protocol.
66
What is the function of frame start?
This field identifies the beginning of a frame.
67
What are two primary responsibilities of the Ethernet MAC sublayer?
accessing the media
data encapsulation
68
What characteristics does the cut through method have?
Low latency.
May forward runt frames.
Begins forwarding when the destination is received.
69
What characteristics does the store and forward method have?
Always stores the entire frame.
Checks the CRC before forwarding.
Checks the frame length before forwarding.
70
Which switching method drops frames that fail the FCS check?
store-and-forward switching
71
What is an advantage for small organizations of adopting IMAP instead of POP?
Messages are kept in the mail servers until they are manually deleted from the email client.
72
A wired laser printer is attached to a home computer. That printer has been shared so that other computers on the home network can also use the printer. What networking model is in use?
peer-to-peer (P2P)
73
A network administrator is adding a new LAN to a branch office. The new LAN must support 200 connected devices. What is the smallest network mask that the network administrator can use for the new network?
255.255.255.0
74
Which wireless technology has low-power and data rate requirements making it popular in home automation applications?
ZigBee
75
What are two characteristics shared by TCP and UDP?
port numbering
use of checksum
76
A client packet is received by a server. The packet has a destination port number of 69. What service is the client requesting?
TFTP
77
What service is provided by Internet Messenger?
An application that allows real-time chatting among remote users.
78
What characteristic describes antispyware?
applications that protect end devices from becoming infected with malicious software
79
A network administrator wants to have the same subnet mask for three subnetworks at a small site. The site has the following networks and numbers of devices:
Subnetwork A: IP phones – 10 addresses
Subnetwork B: PCs – 8 addresses
Subnetwork C: Printers – 2 addresses
What single subnet mask would be appropriate to use for the three subnetworks?
255.255.255.240
80
Which two traffic types use the Real-Time Transport Protocol (RTP)?
video
voice
81
What is the cause of hardware threats?
Physical damage
82
What is the cause of environment threats?
Temperature extremes
83
What is the cause of electrical threats?
Voltage spikes, insufficient voltage, unconditioned power and total power loss.
84
Host A needs to communicate with host D, but host A does not have the MAC address for its default gateway. Which network hosts will receive the ARP request sent by host A?
The ARP broadcast would be sent to every device on the local network. Hosts B, C, and router R1 would receive the broadcast.
85
Which value, that is contained in an IPv4 header field, is decremented by each router that receives a packet?
Time-to-Live
86
What is the tracert command for?
Tracert command can be used to trace the path of an internet protocol.
87
Which two statements describe features of an IPv4 routing table on a router?
Directly connected interfaces will have two route source codes in the routing table: C and S .
If a default static route is configured in the router, an entry will be included in the routing table with source code S .
88
What is the priority order of QoS?
Voice data then Transaction data then web data
89
What is the consequence of configuring a router with the ipv6 unicast-routing global configuration command?
The IPv6 enabled router interfaces begin sending ICMPv6 Router Advertisement messages.
90
If Host1 were to transfer a file to the server, what layers of the TCP/IP model would be used?
application, transport, Internet, and network access layers
91
The global configuration command ip default-gateway 172.16.100.1 is applied to a switch. What is the effect of this command?
The switch can be remotely managed from a host on another network.
92
What characteristic describes adware?
software that is installed on a user device and collects information about the user
93
What is the description of TCP mechanism: acknowledgment
Received by a sender before transmitted more segments in a session.
94
What is the description of TCP mechanism: retransmission
Method of managing segments of lost data
95
What is the description of TCP mechanism: sequence numbers
Used to identify missing segments of data.
96
What is the description of TCP mechanism: window size
Number of bytes a destination device can accept and process at one time
97
What is the purpose of the TCP sliding window?
to request that a source decrease the rate at which it transmits data
98
What technique is used with UTP cable to help protect against signal interference from crosstalk?
twisting the wires together into pairs
99
Which two issues should be considered before implementing fiber optic media?
Fiber optic cabling requires different termination and splicing expertise from what copper cabling requires.
Fiber optic provides higher data capacity but is more expensive than copper cabling.
100
Users are reporting longer delays in authentication and in accessing network resources during certain time periods of the week. What kind of information should network engineers check to find out if this situation is part of a normal network behavior?
the network performance baseline
101
A user is complaining that an external web page is taking longer than normal to load.The web page does eventually load on the user machine. Which tool should the technician use with administrator privileges in order to locate where the issue is in the network?
tracert
102
A client packet is received by a server. The packet has a destination port number of 53. What service is the client requesting?
DNS
103
PC1 issues an ARP request because it needs to send a packet to PC2.
PC2 will send an ARP reply with its MAC address.
When a network device wants to communicate with another device on the same network, it sends a broadcast ARP request. In this case, the request will contain the IP address of PC2. The destination device (PC2) sends an ARP reply with its MAC address.
104
Describe the IPv6 addressing component of global routing prefix.
This network portion of the address is assigned by the provider.
105
Describe the IPv6 addressing component of subnet ID?
This part of the address is used by an organisation to identify subnets.
106
Describe the IPv6 addressing component of an interface ID
This part of the address is the equivalent to the host portion of an IPv4 address.
107
An IPv6 enabled device sends a data packet with the destination address of FF02::2. What is the target of this packet?
all IPv6 configured routers on the local link
108
What are the three parts of an IPv6 global unicast address?
subnet ID
global routing prefix
interface ID
109
What is one main characteristic of the data link layer?
It shields the upper layer protocol from being aware of the physical medium to be used in the communication.
110
Which type of security threat would be responsible if a spreadsheet add-on disables the local software firewall?
Trojan horse
111
What service is provided by HTTPS?
Uses encryption to secure the exchange of text, graphic images, sound, and video on the web.
112
What are the characteristics of an IP address?
contained in the layer 3 header
separated into a network a portion and a unique identifier
32 bits or 128 bits.
113
What are the characteristics of a MAC address?
contained in layer 2 header
separated into OUI and a unique identifier
48 bits.
114
Which two statements are correct about MAC and IP addresses during data transmission if NAT is not involved?
Destination and source MAC addresses have local significance and change every time a frame goes from one LAN to another.
Destination IP addresses in a packet header remain constant along the entire path to a target host.
115
A user is executing a tracert to a remote device. At what point would a router, which is in the path to the destination device, stop forwarding the packet?
when the value in the TTL field reaches zero
116
What are two functions that are provided by the network layer?
directing data packets to destination hosts on other networks
providing end devices with a unique network identifier
117
A network administrator is adding a new LAN to a branch office. The new LAN must support 61 connected devices. What is the smallest network mask that the network administrator can use for the new network?
255.255.255.192
118
What characteristic describes spyware?
software that is installed on a user device and collects information about the user
119
What are three commonly followed standards for constructing and installing cabling?
pinouts
cable lengths
connector types
120
What attribute of a NIC would place it at the data link layer of the OSI model?
MAC address
121
A network administrator needs to keep the user ID, password, and session contents private when establishing remote CLI connectivity with a switch to manage it. Which access method should be chosen?
SSH
122
A user sends an HTTP request to a web server on a remote network. During encapsulation for this request, what information is added to the address field of a frame to indicate the destination?
the MAC address of the default gateway
123
Which two commands can be used on a Windows host to display the routing table?
route print
netstat -r
124
Network A has 100 Hosts what is the prefix?
Network B has 50 Host what is the prefix?
Network C has 25 Hosts what is the prefix?
Network D has 2 Hosts what is the prefix?
Network A /25
Network B /26
Network C /27
Network D /29
125
A technician with a PC is using multiple applications while connected to the Internet. How is the PC able to keep track of the data flow between multiple application sessions and have each application receive the correct packet flows?
The data flow is being tracked based on the source port number that is used by each application.
126
A client packet is received by a server. The packet has a destination port number of 80. What service is the client requesting?
HTTP
127
A user is attempting to access http://www.cisco.com/ without success. Which two configuration values must be set on the host to allow this access?
DNS server
default gateway
128
What method is used to manage contention-based access on a wireless network?
CSMA/CA
129
What are two ICMPv6 messages that are not present in ICMP for IPv4?
Router Advertisement
Neighbor Solicitation
130
What subnet mask is needed if an IPv4 network has 40 devices that need IP addresses and address space is not to be wasted?
255.255.255.192
131
A host is trying to send a packet to a device on a remote LAN segment, but there are currently no mappings in the ARP cache. How will the device obtain a destination MAC address?
It will send an ARP request for the MAC address of the default gateway.
132
What characteristic describes a virus?
malicious software or code running on an end device
133
A disgruntled employee is using some free wireless networking tools to determine information about the enterprise wireless networks. This person is planning on using this information to hack the wireless network. What type of attack is this?
reconnaissance
134
What service is provided by POP3?
Retrieves email from the server by downloading the email to the local mail application of the client.
135
What command can be used on a Windows PC to see the IP configuration of that computer?
ipconfig
136
Which two network addresses can be assigned to the network containing 10 hosts? Your answers should waste the fewest addresses, not reuse addresses that are already assigned, and stay within the 10.18.10.0/24 range of addresses.
10.18.10.224/28
10.18.10.208/28
137
A client packet is received by a server. The packet has a destination port number of 110. What service is the client requesting?
POP3
138
Which layer of the TCP/IP model provides a route to forward messages through an internetwork?
internet
139
What characteristic describes identity theft?
the use of stolen credentials to access private data
140
What two security solutions are most likely to be used only in a corporate environment
intrusion prevention systems
virtual private networks
141
What service is provided by DNS?
Resolves domain names, such as cisco.com, into IP addresses.
142
Which wireless technology has low-power and low-data rate requirements making it popular in IoT environments?
Zigbee
143
What characteristic describes a VPN?
a tunneling protocol that provides remote users with secure access into the network of an organization
144
A network administrator is adding a new LAN to a branch office. The new LAN must support 4 connected devices. What is the smallest network mask that the network administrator can use for the new network?
255.255.255.248
145
During the process of forwarding traffic, what will the router do immediately after matching the destination IP address to a network on a directly connected routing table entry?
switch the packet to the directly connected interface
146
What service is provided by BOOTP?
Legacy application that enables a diskless workstation to discover its own IP address and find a BOOTP server on the network.
147
A client packet is received by a server. The packet has a destination port number of 21. What service is the client requesting?
FTP
148
Describe message encoding
The process of converting information from one format into another acceptable for transmission
149
Describe message sizing
The process of breaking up a long message into individual pieces before being sent over the network
150
Describe message encapsulation
The process of placing one message format inside another message format
151
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?
nslookup
152
What two ICMPv6 message types must be permitted through IPv6 access control lists to allow resolution of Layer 3 addresses to Layer 2 MAC addresses?
neighbor advertisements
neighbor solicitations
153
Which two functions are performed at the LLC sublayer of the OSI Data Link Layer to facilitate Ethernet communication?
places information in the Ethernet frame that identifies which network layer protocol is being encapsulated by the frame
enables IPv4 and IPv6 to utilize the same physical medium
154
Two pings were issued from a host on a local network. The first ping was issued to the IP address of the default gateway of the host and it failed. The second ping was issued to the IP address of a host outside the local network and it was successful. What is a possible cause for the failed ping?
Security rules are applied to the default gateway device, preventing it from processing ping requests.
155
What is a benefit of using cloud computing in networking?
Network capabilities are extended without requiring investment in new infrastructure, personnel, or software.
