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WorksheetsNetworking Fundamentals Worksheet
Total questions: 76
Worksheet time: 38mins
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
The switch advertises routes to neighboring routers
The switch enables spanning tree on all VLANs
The switch changes its management IP address to 172.16.100.1
Which protocol provides connection‑oriented communication with guaranteed delivery?
TCP
UDP
ICMP
ARP
Which term describes the weakening of a signal as it travels through a medium?
Attenuation
Crosstalk
Reflection
Refraction
What is the responsibility of the MAC sublayer?
Provides the method to put frames onto and take frames off the media
Routes packets between different IP networks
Encrypts data from the application layer
Assigns IP addresses dynamically
A site must accommodate 150 hosts. Which subnet mask should be used to provide enough host addresses?
/24 ( 255.255.255.0 )
/25 ( 255.255.255.128 )
/26 ( 255.255.255.192 )
/27 ( 255.255.255.224 )
Which command tests connectivity between two devices using echo request and echo reply messages?
ping
traceroute
arp
telnet
A newly hired technician must order hardware for a small business with a large growth forecast. Which primary factor should guide device selection?
Support for modularity and scalability
Lowest initial cost
Single fixed‑function devices only
Devices with minimal ports to reduce complexity
How many usable host addresses are available in a /27 network?
30
32
28
62
When issuing the ping command on a Cisco router, which symbol indicates that a time expired during the wait for an ICMP echo reply?
.
!
U
?
A help desk technician asks a user to ping the IP address of the default gateway configured on the workstation. What is the purpose of this test?
To verify that the host can reach hosts on other networks
To test DNS resolution for internet hosts
To check the local NIC’s driver version
To ensure the gateway is using DHCP
According to the Internet Assigned Numbers Authority (IANA), how many types of ports exist?
Three: well‑known, registered, and dynamic/private
Two: well‑known and dynamic
Four: system, user, dynamic, and private
One: universal
Which two tasks can be performed by a local DNS server? (Choose two.)
Mapping names to IP addresses for internal hosts
Forwarding unresolved queries to external DNS servers
Allocating IP addresses to clients
Encrypting DNS traffic by default
Performing NAT for all internal hosts
Power outlets and network switches in a wiring closet malfunction after an air‑conditioning unit fails. What type of threat does this situation describe?
Environmental
Internal malicious attack
External hacker intrusion
Configuration error
A network engineer analyzes reports from a recently performed network baseline. Which situation indicates a possible latency issue?
An increase in host‑to‑host ping response times
A decrease in CPU utilization on routers
Stable interface error counters
A reduction in average cable lengths
Which command allows log messages to be displayed on remotely connected Telnet or SSH sessions?
terminal monitor
logging buffered
show logging
debug all
Convert the binary IPv4 address 01010000.01010000.10111111.10111101 to decimal format.
80.80.191.189
80.72.191.221
79.80.191.189
80.80.190.189
Which type of network connects a smartphone to a laptop using Bluetooth?
Personal Area Network (PAN)
Local Area Network (LAN)
Metropolitan Area Network (MAN)
Wide Area Network (WAN)
Which two characteristics describe Ethernet MAC addresses? (Choose two.)
They are expressed as 12 hexadecimal digits
They are globally unique
They include a subnet mask
They are assigned per IPv4 network
They change every time a device reboots
What happens if you configure login under the console line but no password is set?
Console access is denied because a password is required
Console access is allowed without a password
VTY access is disabled
The device reloads automatically
Which statement is true about the command copy running‑config startup‑config?
The startup configuration is stored in NVRAM
It stores the startup configuration in RAM
It copies the startup configuration to the running configuration
It erases the startup configuration before copying
What process converts received transmitted data into a readable message?
Decoding
Encoding
Segmentation
Multiplexing
What is contained in the trailer of a data‑link frame?
Error detection (Frame Check Sequence)
Source IP address
Destination port number
Routing information
Which three Layer 2 functions does a router perform when forwarding traffic between interfaces? (Choose three.)
Accepts a frame from a medium
De‑encapsulates the frame
Re‑encapsulates the packet into a new frame
Learns the destination IP via ARP
Assigns a new MAC address to the source host
Which two are examples of cut‑through switching methods? (Choose two.)
Fast‑forward switching
Fragment‑free switching
Store‑and‑forward switching
Adaptive buffering
Circuit switching
Under which two circumstances will a switch flood a frame out of every port except the one it was received on? (Choose two.)
The destination MAC address is unknown to the switch
The frame has a broadcast destination address
The source MAC address is unknown to the switch
The destination is on a different VLAN
The frame is larger than the MTU
What ARP property causes cached IP‑to‑MAC mappings to be purged automatically after a period of time?
Entries are time‑stamped and removed after a timeout
ARP uses static tables only
ARP relies on TCP timers
ARP caches never expire
What property of ARP causes cached IP-to-MAC mappings to remain in memory longer?
Entries are time-stamped and are purged only after the timeout expires
Mappings are stored permanently until the device reboots
Entries are refreshed every second automatically
Mappings are cleared only when the ARP table is full
A router prompt changes from Router(config)# to Router(config-if)#. What does this indicate?
User EXEC mode was entered
Global configuration mode was entered
Interface configuration mode was entered
Privilege level was reduced
What happens when you enter the command no shutdown on an interface?
The interface is disabled and stops forwarding traffic
The interface is activated (brought up) and can start passing traffic
The interface is deleted from the configuration
The interface is reset to factory defaults
What is the usable number of host IP addresses on a network that has a /30 mask?
0
2
4
6
When issuing the ping command on a router, which symbol indicates that an ICMP message of destination unreachable was received?
U
.
!
C
Which of the following commonly use UDP? (Choose three.)
DNS queries
DHCP (Dynamic Host Configuration Protocol)
Streaming video/audio and online gaming
Secure Shell (SSH)
File Transfer Protocol (FTP)
Which three protocols or standards operate at the application layer of the TCP/IP model? (Choose three.)
HTTP
MPEG
GIF
TCP
IP
Which example best describes a Trojan horse?
Malware that was written to look like a video game
A worm that scans for open ports
A virus that targets boot sectors
Adware that displays pop-up ads
Which is appropriate for providing endpoint security?
Antivirus software
Routing protocols
DHCP servers
Network cabling
What information about a Cisco router can be verified using the show version command?
The value of the configuration register
Current routing table entries
Interface bandwidth utilization
Running access control lists
What are three ways that media access control is used in networking? (Choose three.)
Ethernet utilizes CSMA/CD
Media access control provides placement of data frames onto the media
Data link layer protocols define the rules for access to different media
IP layer controls broadcast storm suppression
Application layer determines link speed
What is one advantage of using the cut-through switching method instead of the store-and-forward switching method?
Lower latency appropriate for high-performance computing applications
Stronger error checking of frames
Support for QoS classification only
Requires more buffering of frames
Which term describes the field in the IPv4 packet header used to detect corruption in the header?
Header checksum
Frame check sequence
Version
Flags
What information in the Ethernet frame header is examined by a Layer 2 device in order to forward the data onward?
Destination MAC address
Source IP address
Destination port number
TTL value
An administrator wants to create four subnets from the network address 192.168.1.0/24. What is the network address and subnet mask of the third usable subnet?
192.168.1.64 with subnet mask 255.255.255.192
192.168.1.32 with subnet mask 255.255.255.224
192.168.1.128 with subnet mask 255.255.255.192
192.168.1.96 with subnet mask 255.255.255.224
What is the network address for 245.143.83.86/28 (write in dotted decimal)?
245.143.83.80
245.143.83.64
245.143.83.96
245.143.83.88
What is the next network address for 187.249.199.72/22 (write in dotted decimal)?
187.249.200.0
187.249.199.0
187.249.204.0
187.249.196.0
What is the next network address for 187.249.199.72/22? Select the correct IPv4 address in dotted-decimal format.
187.249.198.0
187.249.200.0
187.249.201.0
187.249.199.0
A network administrator is testing connectivity by issuing the ping command on a router. Which symbol indicates receipt of an ICMP echo reply message?
.
!
U
?
*
Which command in the Windows command line is used to display active connections?
ipconfig
netstat
tracert
nslookup
What do the client/server and peer-to-peer network models have in common?
Both models support devices in server and client roles.
Both models require dedicated servers only.
Both models eliminate the need for clients.
Both models always use centralized authentication.
For security reasons a network administrator needs to ensure that local computers cannot ping each other. Which settings can accomplish this task?
DNS settings
firewall settings
routing settings
DHCP settings
Convert the IPv6 address 0000:0000:0000:0000:0000:0000:0001 to its short form.
0:1
::1
::0001
0001::
What kind of network uses point-to-point, hub-and-spoke, or mesh topologies?
LAN
PAN
WAN
SAN
Which duplex communication method is used in WLANs?
full-duplex
half-duplex
simplex
auto-duplex
Which statements describe features or functions of the Logical Link Control (LLC) sublayer in Ethernet standards? (Choose two.)
It is implemented in software.
It communicates with the upper layers of the protocol suite.
It performs media access control addressing.
It handles physical signal encoding.
What is one advantage that the IPv6 simplified header offers over IPv4?
larger checksum field
efficient packet handling
mandatory fragmentation
more options in the base header
What is the next network address for 158.33.157.80/23? Select the correct IPv4 address in dotted-decimal format.
158.33.156.0
158.33.157.0
158.33.158.0
158.33.159.0
A technician suspects a defective node is causing packets to be dropped and only has the IP address of the end device. Which command can identify where the path fails?
ipconfig
tracert
arp -a
telnet
Which commands are encapsulated by the ICMP protocol? (Choose two.)
ping
tracert
ftp
ssh
What is true about the Server Message Block (SMB) protocol?
Clients establish a long-term connection to servers.
Clients send single, connectionless requests only.
It operates at the Physical layer.
It is used only for email services.
Which application layer protocol is used to provide file-sharing and print services to Microsoft applications?
FTP
SMB
SMTP
SNMP
Convert the binary IPv4 address 01100000.00101111.00100111.00110001 to decimal dotted format.
96.47.39.49
96.46.38.48
97.47.39.49
95.47.39.49
What does the ICMPv6 Router Advertisement (RA) message include? (Choose three.)
Router Lifetime
Prefix Information
MTU
DHCPv4 offer
TCP window size
What kind of threat is described when a threat actor sends a virus that can reformat your hard drive?
data loss or manipulation
phishing
eavesdropping
password spraying
What factor should be considered in the design of a small network when choosing devices?
cost of devices
presence of MPLS
availability of satellite links
use of dual-stack BGP
Why would a network administrator use the tracert utility?
to assign IP addresses to hosts
to identify where a packet was lost or delayed on a network
to resolve domain names
to capture packets for analysis
Convert the decimal number 156 to its hexadecimal equivalent.
8C
9C
A6
7E
What does obtaining a local IPv6 link address statically mean for a device?
The address is assigned automatically by SLAAC.
The address is assigned by DHCPv6.
The address is manually configured by a person.
The device generates the address from EUI-64.
Your organization is issued the IPv6 prefix 2001:db8:130f::/48. With this prefix, how many bits are available to create /64 subnetworks when interface ID bits are not borrowed?
8
12
16
32
Which functionality is provided by DHCP?
automatic assignment of an IP address to each host
routing between autonomous systems
encryption of user data
name resolution for domains
Which memory location on a Cisco router or switch stores the startup configuration file?
RAM
ROM
NVRAM
Flash
Which of the following is the Protocol Data Unit (PDU) at the Physical layer?
frames
packets
segments
bits
Which statements describe services provided by the data link layer? (Choose two.)
It manages the access of frames to the network media.
It packages various Layer 3 PDUs into a frame format compatible with the network interface.
It performs end-to-end routing decisions.
It handles application-level encryption.
Which switching method uses the CRC value in a frame to make a forwarding decision?
cut-through
store-and-forward
fragment-free
fast-forward
What information does a loopback test provide?
The TCP/IP stack on the device is working correctly.
The ISP connection is down.
The default gateway is unreachable.
The DNS server is misconfigured.
Within a production network, what is the purpose of configuring a switch with a default gateway address?
to translate private addresses to public
to forward packets originating from the switch to remote networks
to encrypt management traffic
to enable VLAN trunking
What property of ARP causes NICs receiving an ARP request to pass the data portion of the Ethernet frame to the ARP process?
the EtherType field 0x806 appearing in the Ethernet frame header
a destination MAC of FF:FF:FF:FF:FF:FF
a TTL of 255
a header length of 20 bytes
Which statement describes the treatment of ARP requests on the local link?
They are received and processed by every device on the local network.
They are filtered by routers only.
They are sent unicast to a single host.
They are discarded by switches.
What is the usable number of host IP addresses on a network that has a /29 mask?
2
4
6
8
