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WorksheetsICMPv6, HTTP, IMAP vs POP, and Network Troubleshooting Utilities
Total questions: 60
Worksheet time: 30mins
Which two ICMPv6 message types are unique to IPv6 and not present in ICMP for IPv4? (Choose two.)
Neighbor Solicitation and Router Advertisement
Destination Unreachable and Time Exceeded
Echo Request and Echo Reply
Host Confirmation and Route Redirection
A server receives a packet with destination port 80. Which service is being requested?
DHCP service on UDP
SMTP email on TCP
DNS queries on UDP
HTTP web service on TCP
For small organizations, what is a key advantage of using IMAP instead of POP for email?
POP stores all mail centrally for long periods
IMAP keeps messages on the server until deleted
POP retrieves and sends mail while IMAP only retrieves
IMAP downloads messages to client and deletes server copies
A technician can ping the web server’s IP but not its URL. Which utility should be used next to diagnose the issue?
tracert to map path hops
nslookup to test DNS name resolution
ipconfig to view local IP settings
netstat to list active TCP sessions
In Ethernet, which function is performed by the LLC sublayer of the OSI Data Link Layer?
Integrates Layer 2 flows across different Ethernet speeds
Adds control information identifying the network layer protocol
Implements CSMA/CD on shared half‑duplex media
Applies source and destination MAC addresses
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 gains a management interface 172.16.100.1
The switch is limited to frames to and from 172.16.100.1
The switch can communicate with hosts on 172.16.100.0
The switch can be remotely managed from another network
What happens when the transport input ssh command is entered on the switch vty lines?
Remote connections require proprietary client software
Communication with remote users becomes encrypted
A username and password are required for remote access
The SSH client on the switch is enabled
Match the type of threat with the cause. (Not all options are used.)
hardware threats
environmental threats
electrical threats
maintenance threats
A disgruntled employee uses free wireless tools to gather information about enterprise wireless networks, planning to use it to hack the network. What type of attack is this?
Access
Privilege escalation
DoS
Reconnaissance
Which command allows a switch to reach devices outside its local subnet for management traffic?
ip default-gateway 172.16.100.1
ip default-network 172.16.100.1
interface vlan1 ip 172.16.100.1
ip route 0.0.0.0 0.0.0.0 172.16.100.1
Which example best fits an environmental threat to network equipment?
Voltage spikes and brownouts
Electrostatic discharge during handling
Physical damage to cabling plant
Humidity extremes or temperature extremes
Which statement correctly describes why configuring a default gateway on a Layer 2 switch is important?
It assigns a management IP address to VLAN1
It lets the switch forward frames between subnets
It enables inter-VLAN routing for all interfaces
It allows remote management from different networks
Which statement best describes the core function of HTTP?
A file transfer protocol for servers
A rule set for exchanging web text and media
A chat application for real-time messaging
A secure protocol for encrypted remote shells
A server receives a packet with destination port 67. Which service is being requested?
FTP service over TCP
DHCP service for IP leasing
Telnet interactive login
SSH encrypted terminal
What is a primary impact of ARP requests on a local subnet when they occur in large volumes?
They broadcast and flood all ports
They consume high payload bandwidth
They are unicast to one host only
They are filtered by routers only
Which Windows CLI utilities help confirm IP address, DNS settings, and local router connectivity? Select the best trio.
nslookup, telnet, ftp
ping, ipconfig, nslookup
netsh, telnet, arp -a
tracert, ssh, netsh
After a router matches a destination IP to a directly connected network entry, what is the next action?
Analyze layer-4 port values
Drop traffic after route check
Switch packet to that interface
Consult the next-hop address
Which option describes antispyware most accurately?
Applications protecting endpoints from spyware
A VPN tunneling remote user sessions
A router software filtering IP applications
A device filtering inbound network traffic
To keep credentials and session data private during remote CLI management of a switch, which access method should be used?
SSH encrypted access
Telnet plaintext terminal
Console local login
AUX serial console
Which two practices most effectively reduce malware risk on endpoints? Choose the best pair.
Deploy a VPN service
Enable network firewalls
Use RAID storage arrays
Set strong user passwords
Keep OS and apps updated
Install and update antivirus software is an example of which cybersecurity countermeasure?
Operational policy for backups
Endpoint protection against malware
Physical access control systems
Network segmentation techniques
Which type of security threat could disable a local software firewall when hidden inside a spreadsheet add-on?
Buffer overflow exploit
Brute-force password attack
Denial of Service flood
Trojan horse malware
Which frame field helps a destination node verify that the received data signal was not altered in transit?
Frame check sequence field
Transport layer error code
User Datagram Protocol tag
Flow control indicator
A new LAN must support 4 connected devices. What is the smallest usable subnet mask to meet this requirement?
255.255.255.248
255.255.255.192
255.255.255.128
255.255.255.0
What does the POP3 service do for an email client?
Provides real-time chat capability
Enables remote network device access
Downloads email to local mail application
Uses encryption for secure remote access
Which two security solutions are typically found only in corporate environments? (Choose two.)
Antispyware utilities
Virtual private networks
Strong password policies
Intrusion prevention systems
Which description best matches antivirus software?
Network device filtering traffic
Applications that protect end devices
Tunneling protocol for remote users
Router software filtering IP traffic
How does a router prevent an IPv4 packet from circulating endlessly?
Increments TTL and discards at 100
Checks TTL and discards at 0
Checks TTL and discards at 100
Decrements TTL and discards at 0
A packet arrives with destination port number 69. Which service is requested?
DNS
DHCP
TFTP
SMTP
To accept only encrypted SSH on router vty lines, which configuration steps are required? (Choose three.)
Configure DNS on the router
Generate SSH key pairs
Enable inbound vty SSH sessions
Set IP domain name on router
At the MAC sublayer of Ethernet, which function is performed to ensure error detection?
Communicate between upper layers and NIC
Insert trailer with FCS in frames
Identify encapsulated network protocol
Add Ethernet control to protocol data
Which MAC sublayer function delimits fields within an Ethernet II frame?
Provide NIC-to-software interface
Implement frame field delimitation
Place protocol identifier field
Attach additional control metadata
Which IPv6 multicast address targets all IPv6 configured routers on the local link?
FF05::2 on the site
FF00::1 on the network
FF02::2 on the local link
FF02::1 on the local link
When planning a wireless network, which areas should be accounted for?
Packet collision, VLANs, SSID naming
Extensive cabling, mobility, channel bonding
Interference, security, coverage area
QoS, routing, DHCP scope sizing
Which contention-based access method is used on Wi‑Fi networks?
CSMA/CD
Priority ordering
CSMA/CA
Token passing
Which statement best describes a function of the data link layer?
Provides global routing and path selection
Provides formatting and framing of data
Provides delivery between applications on hosts
Provides end-to-end delivery between hosts
On a Cisco device, what is the fastest way to verify a newly configured login banner?
Enter CTRL‑Z at privileged mode
Exit global configuration mode
Exit privileged EXEC mode and press Enter
Power cycle the device
What is the purpose of the TCP sliding window?
to ensure segments arrive in order at the destination
to request that a source decrease the rate at which it transmits data
to inform a source to retransmit data from a specific point forward
to end communication when data transmission is complete
What characteristic describes spyware?
a network device that filters access and traffic coming into a network
software that is installed on a user device and collects information about the user
an attack that slows or crashes a device or network service
the use of stolen credentials to access private data
Which switching method drops frames that fail the FCS check?
ingress port buffering
borderless switching
store-and-forward switching
cut-through switching
Which range of link-local addresses can be assigned to an IPv6-enabled interface?
FF00::/8
FDEE::/7
FECO::/10
FE80::/10
What service is provided by FTP?
A basic set of rules for exchanging text, graphic images, sound, video, and other multimedia files on the web.
Allows for data transfers between a client and a file server.
Uses encryption to secure the exchange of text, graphic images, sound, and video on the web.
An application that allows real-time chatting among remote users.
A host cannot reach http://www.example.com. Which two configuration values must be set on the host to allow this access? (Choose two.)
DNS server and source MAC
Source MAC and HTTP server
Default gateway and source port
DNS server and default gateway
Source port and HTTP server
Which two statements describe an impact of deploying NAT for IPv4 in a network? (Choose two.)
Breaks some end-to-end connectivity
Increases packet handling efficiency
Improves switch performance
Slows IPv4 address depletion
Adds authentication to IPv4 sessions
An IPv6 interface uses EUI-64 to derive its interface ID from MAC 1C-6F-65-C2-BD-F8. What is the resulting interface ID?
0C6F:65FF:FEC2:BDF8
106F:65FF:FEC2:BDF8
1E6F:65FF:FEC2:BDF8
C16F:65FF:FEC2:BDF8
PC1 needs to send a packet to PC2 on the same network and issues an ARP request. What happens next?
Switch SW1 replies with SW1 Fa0/1 MAC
RT1 replies with the PC2 MAC
SW1 replies with the PC2 MAC
Router RT1 replies with RT1 Fa0/0 MAC
PC2 replies with its own MAC
Which service is provided by BOOTP?
Legacy discovery of IP and a BOOTP server
Rules for exchanging multimedia files
Encrypted exchange of web media
Client-to–file server data transfers
Automatic VPN establishment
Which description best characterizes adware?
Malware that encrypts files for ransom
Network device filtering traffic
Software installed that collects user information
Attack that slows a device or network
Use of stolen credentials for data access
A switch port has a user-defined error threshold. When the threshold is reached, to which switching method does the port revert?
Cut-through method
Store-and-forward method
Fast-forward method
Fragment-free method
Adaptive switching method
Which statement best characterizes a peer-to-peer network model?
Each device can only operate in one fixed role
Client and server roles change per individual request
A dedicated server provides centralized services
Devices require a specialized client interface
In a peer-to-peer application context, which condition is typically required?
Logical addressing is centrally managed
A background service must be running
No user interface is needed for access
Roles are permanently assigned to devices
Which two responsibilities are performed by the Ethernet MAC sublayer? (Choose two)
Frame delimiting and media access control
Data encapsulation and accessing the media
Error detection and correction of IP headers
Logical addressing and route selection
You run show ip interface brief on a switch. One FastEthernet interface shows status up/up, others are down/down, and Vlan1 has an IP address with up/up. What can you infer?
One physical port has an active device attached
The switch cannot be managed remotely
Passwords are configured on all lines
Two devices are connected to two ports
Which statement distinguishes a peer-to-peer network from a client-server network?
Requires formal user accounts and permissions
Devices can only function in one role at a time
Does not require a dedicated server for operation
Depends on a background service on servers
A switch has Vlan1 configured with an IP address and shows protocol up. What operational capability does this enable?
Remote management via the SVI
DHCP relay without additional setup
Automatic password enforcement
Dynamic routing between VLANs
Match each type of frame field to its function. (Not all options are used.)
addressing → directs frame toward destination; error detection → checks damage; type → LLC identifies Layer 3; frame start → identifies beginning
addressing → LLC identifies Layer 3; error detection → identifies beginning; type → directs frame; frame start → checks damage
addressing → checks damage; error detection → directs frame; type → identifies beginning; frame start → LLC identifies Layer 3
Which function corresponds to the frame field used by the LLC to identify the Layer 3 protocol?
type field indicates Layer 3 protocol
addressing field indicates Layer 3 protocol
frame start field indicates Layer 3 protocol
error detection field indicates Layer 3 protocol
What is the subnet ID associated with the IPv6 address 2001:DA48:FC5:A4:3D1B::1/64?
2001:DA48:FC5:A4::/64
2001:DA48:FC5::A4:/64
2001::/64
2001:DA48:/64
Which frame field checks if the frame has been damaged during transfer?
addressing field checks damage
frame start field checks damage
type field checks damage
error detection field checks damage
Which frame field identifies the beginning of a frame?
error detection field marks beginning
addressing field marks beginning
type field marks beginning
frame start field marks beginning
