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WorksheetsCCNA
Total questions: 20
Worksheet time: 10mins
What is the primary function of a Layer 2 switch?
Route packets between different networks
Forward frames based on MAC addresses
Assign IP addresses to hosts
Filter traffic using URL-based rules
Which device operates primarily at Layer 3 of the OSI model?
Hub
Switch
Router
PC
What does a PC use to communicate on a local network?
Only its IP address
Its MAC and IP addresses
Only its default gateway
Its serial number
What is the default gateway used for on a PC?
To resolve domain names
To send traffic to destinations outside the local subnet
To assign IP addresses automatically
To connect to a switch
Which network device regenerates signals but does not examine frame content?
Switch
Router
Hub
PC
At which OSI layer does a standard Ethernet switch (like Cisco Catalyst) make forwarding decisions?
Layer 1
Layer 2
Layer 3
Layer 4
When a switch receives a frame with an unknown destination MAC address, what does it do?
Drops the frame
Floods the frame out all ports except the incoming port
Sends an ARP request
Forwards it to the default gateway
Which interface type on a Cisco 2911 router would you typically use to connect to a LAN switch?
Console port
AUX port
GigabitEthernet interface
Serial interface
What table does a Layer 2 switch build and use for forwarding decisions?
Routing table
MAC address table
ARP table
NAT table
Which device can segment broadcast domains by default?
Switch
Hub
Router
Repeater
On a Cisco 2911 router, which command enters interface configuration mode for GigabitEthernet 0/0?
interface g0/0
interface GigabitEthernet 0/0
config g0/0
enable interface g0/0
What happens when you connect two switches using a standard Ethernet cable (without Auto-MDIX)?
Nothing—they auto-negotiate
You need a crossover cable for proper communication
Traffic is routed automatically
The link fails permanently
Which of the following is stored in a Cisco router’s RAM and lost on reboot?
IOS image
Running configuration
Startup configuration
Boot system commands
What is the purpose of the no shutdown command on a Cisco router interface?
Reboots the interface
Enables the interface (brings it up)
Deletes the interface configuration
Disables security features
A PC sends a packet to a server in a different subnet. Which destination MAC address is in the frame leaving the PC?
The server’s MAC address
The default gateway’s MAC address
FF:FF:FF:FF:FF:FF
00:00:00:00:00:00
Which command displays the MAC address table on a Cisco Catalyst switch?
show arp
show mac address-table
show interfaces
show forwarding-table
What is the administrative distance of a directly connected network on a Cisco router?
0
1
90
120
On a Cisco 2911, what is the function of the HWIC slots?
Store the IOS
Allow installation of modular network interfaces (e.g., serial, T1)
Provide power redundancy
Connect to the console
What does the ‘2911’ in Cisco 2911 router indicate?
It supports 2911 Mbps throughput
It’s part of the ISR G2 (Integrated Services Router) series
It has 29 WAN and 11 LAN ports
It was released in 2011
When a switch receives a frame with a source MAC it hasn’t seen before, what does it do?
Drops the frame
Floods it
Adds the source MAC and incoming port to its MAC table
Sends a ping to verify reachability
