CCNA Cyber Ops Version 11 Chapter 4 Exam Answers Full
CCNA Cyber Ops Version 11 Chapter 4 Exam Answers Full
CCNA Cyber Ops Version 11 Chapter 4 Exam Answers Full
May 13,
2019
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1. Which message does an IPv4 host use to reply when it receives a DHCPOFFER
message from a DHCP server?
DHCPACK
DHCPREQUEST *
DHCPDISCOVER
DHCPOFFER
B. When the client receives the DHCPOFFER from the server, it sends back a
DHCPREQUEST broadcast message. On receiving the DHCPREQUESTmessage, the server
replies with a unicast DHCPACK message.
Session
Transport *
Network
Data link
B. The transport layer of the OSI model has several responsibilities. One of the primary
responsibilities is to segment data into blocks that can be reassembled in proper
sequence at the destination device.
3. PC1 and PC3 are on different networks separated by a router, RT1. PC1 issues an
ARP request because it needs to send a packet to PC3. In this scenario, what will
happen next?
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RT1 will send an ARP reply with its own MAC address. *
RT1 will send an ARP reply with the PC3 MAC address.
The client can download data from or upload data to the server. *
The client can choose if FTP is going to establish one or two connections with the
server.
FTP is a peer-to-peer application.
FTP does not provide reliability during data transmission.
A. FTP is a client/server protocol. FTP requires two connections between the client and
the server and uses TCP to provide reliable connections. With FTP, data transfer can
happen in either direction. The client can download (pull) data from the server or upload
(push) data to the server.
6. Which two OSI model layers have the same functionality as two layers of the
TCP/IP model? (Choose two.)
Session
Transport *
Network *
Data link
Physical
B, C. The OSI transport layer is functionally equivalent to the TCP/IP transport layer, and
the OSI network layer is equivalent to the TCP/IP Internet layer. The OSI data link and
physical layers together are equivalent to the TCP/IP network access layer. The OSI
session layer (with the presentation layer) is included within the TCP/IP application layer.
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The TCP/IP transport layer and OSI Layer 4 provide similar services and
functions. *
The TCP/IP network access layer has similar functions to the OSI network layer.
The OSI Layer 7 and the TCP/IP application layer provide identical functions.
The first three OSI layers describe general services that are also provided by the
TCP/IP Internet layer.
A. The TCP/IP Internet layer provides the same function as the OSI network layer. The
transport layer of both the TCP/IP and OSI models provides the same function. The
TCP/IP application layer includes the same functions as OSI Layers 5, 6, and 7.
2001::abcd::1
2001:0:abcd::1
2001::abcd:0:1
2001:0:0:abcd::1 *
2001:0000:abcd::1
9. What three application layer protocols are part of the TCP/IP protocol suite?
(Choose three.)
ARP
DHCP *
DNS *
FTP *
NAT
PPP
B, C, D. DNS, DHCP, and FTP are all application layer protocols in the TCP/IP protocol
suite. ARP and PPP are network access layer protocols, and NAT is an Internet layer
protocol in the TCP/IP protocol suite.
10. If the default gateway is configured incorrectly on the host, what is the impact
on communications?
11. Which message delivery option is used when all devices need to receive the
same message simultaneously?
Duplex
Unicast
Multicast
Broadcast *
D. When all devices need to receive the same message simultaneously, the message
would be delivered as a broadcast. Unicast delivery occurs when one source host sends
a message to one destination host. The sending of the same message from a host to a
group of destination hosts is multicast delivery. Duplex communications refers to the
ability of the medium to carry messages in both directions.
A DHCPDISCOVER message is sent with a multicast IP address that all DHCP servers
listen to as the destination address.
A DHCPDISCOVER message is sent with the broadcast IP address as the
destination address.
A DHCPDISCOVER message is sent with the IP address of the default gateway as the
destination address.
A DHCPDISCOVER message is sent with the IP address of the DHCP server as the
destination address.
The DHCPDISCOVER message is sent by a DHCPv4 client and targets a broadcast IP along
with the destination port 67. The DHCPv4 server or servers respond to the DHCPv4
clients by targeting port 68.
The IP address 192.168.25.10 is an IPv4 private address. This address will not be routed
over the Internet, so school A will not be able to reach school B. Because the address is a
private one, it can be used freely on an internal network. As long as no two devices on
the internal network are assigned the same private IP, there is no IP conflict issue.
Devices that are assigned a private IP will need to use NAT in order to communicate over
the Internet.
the combination of the source and destination sequence numbers and port
numbers
the combination of a source IP address and port number or a destination IP
address and port number
the combination of the source and destination sequence and acknowledgment
numbers
the combination of the source and destination IP address and source and
destination Ethernet address
A socket is a combination of the source IP address and source port or the destination IP
address and the destination port number.
www
http
index
com
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Refer to the exhibit. A cybersecurity analyst is viewing captured ICMP echo
request packets sent from host A to host B on switch S2. What is the source MAC
address of Ethernet frames carrying the ICMP echo request packets?
08-CB-8A-5C-D5-BA
00-D0-D3-BE-79-26
00-60-0F-B1-D1-11
01-90-C0-E4-55-BB
When router R1 receives the ICMP echo requests from host A it will forward the packets
out interface G0/1 towards host B. However, before forwarding the packets, R1 will
encapsulate them in a new Ethernet frame using the MAC address of interface G0/1 as
the source and the MAC address of host B as the destination.
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PC-A
router DG
DSN server
router ISP
web server
The Wireshark capture is of a DNS query from PC-A to the DNS server. Because the DNS
server is on a remote network, the PC will send the query to the default gateway router,
router DG, using the MAC address of the router G0/0 interface on the router.
18. Which term is used to describe the process of placing one message format
inside another message format?
encoding
multiplexing
encapsulation
segmentation
The encapsulation process is performed at each OSI layer and is the process of placing
one message format inside another message format.
19. Which PDU format is used when bits are received from the network medium by
the NIC of a host?
frame
file
packet
segment
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When received at the physical layer of a host, the bits are formatted into a frame at the
data link layer. A packet is the PDU at the network layer. A segment is the PDU at the
transport layer. A file is a data structure that may be used at the application layer.
An ARP request is sent to all devices on the Ethernet LAN and contains the IP
address of the destination host and its multicast MAC address.
If no device responds to the ARP request, then the originating node will broadcast
the data packet to all devices on the network segment.
When a host is encapsulating a packet into a frame, it refers to the MAC address
table to determine the mapping of IP addresses to MAC addresses.
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.
If a device receiving an ARP request has the destination IPv4 address, it
responds with an ARP reply.
When a node encapsulates a data packet into a frame, it needs the destination MAC
address. First it determines if the destination device is on the local network or on a
remote network. Then it checks the ARP table (not the MAC table) to see if a pair of IP
address and MAC address exists for either the destination IP address (if the destination
host is on the local network) or the default gateway IP address (if the destination host is
on a remote network). If the match does not exist, it generates an ARP broadcast to seek
the IP address to MAC address resolution. Because the destination MAC address is
unknown, the ARP request is broadcast with the MAC address FFFF.FFFF.FFFF. Either the
destination device or the default gateway will respond with its MAC address, which
enables the sending node to assemble the frame. If no device responds to the ARP
request, then the originating node will discard the packet because a frame cannot be
created.
21. In NAT translation for internal hosts, what address would be used by external
users to reach internal hosts?
outside global
outside local
inside local
inside global
From the perspective of a NAT device, inside global addresses are used by external users
to reach internal hosts. Inside local addresses are the addresses assigned to internal
hosts. Outside global addresses are the addresses of destinations on the external
network. Outside local addresses are the actual private addresses of destination hosts
behind other NAT devices.
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22. The exhibit shows a network topology. PC1 and PC2 are connected to the Fa0/1
and Fa0/2 ports of the SW1 switch, respectively. SW1 is connected through its Fa0/3
port to the Fa0/0 interface of the RT1 router. RT1 is connected through its Fa0/1 to
the Fa0/2 port of SW2 switch. SW2 is connected through its Fa0/1 port to the PC3.
Refer to the exhibit. PC1 issues an ARP request because it needs to send a packet
to PC2. In this scenario, what will happen next?
SW1 will send an ARP reply with the PC2 MAC address.
PC2 will send an ARP reply with its MAC address.
RT1 will send an ARP reply with its Fa0/0 MAC address.
RT1 will send an ARP reply with the PC2 MAC address.
SW1 will send an ARP reply with its Fa0/1 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.
23. Which two characteristics are associated with UDP sessions? (Choose two.)
TCP:
• Provides tracking of transmitted data segments
• Destination devices will acknowledge received data.
• Source devices will retransmit unacknowledged data.
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UDP
• Destination devices will not acknowledge received data
• Headers use very little overhead and cause minimal delay.
24. Refer to the exhibit. What is the global IPv6 address of the host in
uncompressed format?
2001:0DB8:0000:0000:0BAF:0000:3F57:FE94
2001:0DB8:0000:0BAF:0000:0000:3F57:FE94
2001:DB80:0000:0000:BAF0:0000:3F57:FE94
2001:0DB8:0000:0000:0000:0BAF:3F57:FE94
In the compressed format, the :: represents two contiguous hextets of all zeros. Leading
zeros in the second, fifth, and sixth hextets have also been removed.
26. Which application layer protocol uses message types such as GET, PUT, and
POST?
SMTP
POP3
DHCP
HTTP
DNS
The GET command is a client request for data from a web server. A PUT command
uploads resources and content, such as images, to a web server. A POST command
uploads data files to a web server.
TCP uses the 3-way handshake. UDP does not use this feature. The 3-way handshake
ensures there is connectivity between the source and destination devices before
transmission occurs.
28. What is the prefix length notation for the subnet mask 255.255.255.224?
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29. What are two potential network problems that can result from ARP operation?
(Choose two.)
Multiple ARP replies result in the switch MAC address table containing entries that
match the MAC addresses of hosts that are connected to the relevant switch port.
Network attackers could manipulate MAC address and IP address mappings
in ARP messages with the intent of intercepting network traffic.
On large networks with low bandwidth, multiple ARP broadcasts could cause
data communication delays.
Manually configuring static ARP associations could facilitate ARP poisoning or MAC
address spoofing.
Large numbers of ARP request broadcasts could cause the host MAC address table
to overflow and prevent the host from communicating on the network.
sequence numbers
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FCS
acknowledgments
window size
TCP segments are acknowledged by the receiver as they arrive. The receiver keeps track
of the sequence number of received segments and uses the sequence number to
reorder the segments and to identify any missing segments that need to be
retransmitted.
The purpose of ICMP messages is to provide feedback about issues that are related to
the processing of IP packets.
32. What happens if part of an FTP message is not delivered to the destination?
The message is lost because FTP does not use a reliable delivery method.
The part of the FTP message that was lost is re-sent.
The FTP source host sends a query to the destination host.
The entire FTP message is re-sent.
Because FTP uses TCP as its transport layer protocol, sequence and acknowledgment
numbers will identify the missing segments, which will be re-sent to complete the
message.
NAT was developed to conserve IPv4 addresses. A side benefit is that NAT adds a small
level of security by hiding the internal network addressing scheme. However, there are
some drawbacks of using NAT. It does not allow true peer-to-peer communication and it
adds latency to outbound connections.
34. Why does a Layer 3 device perform the ANDing process on a destination IP
address and subnet mask?
ANDing allows us to identify the network address from the IP address and the network
mask.
35. Refer to the exhibit. Using the network in the exhibit, what would be the
default gateway address for host A in the 192.133.219.0 network?
192.135.250.1
192.133.219.0
192.133.219.1
192.31.7.1
192.167.10.10
10.1.1.1
192.168.5.5
172.16.4.4
172.32.5.2
224.6.6.6
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CCNA Cybersecurity Operations (Version 1.1) - CyberOps Chapter 4
Exam Answers.pdf
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