Cisco CCNA Basic Switching Concepts 5 — Questions and Answers
Question 1: Which of the following correctly describes a broadcast domain in a switched network?
- All devices connected to the same switch port
- All devices in the same VLAN (Correct answer)
- All devices separated by a router interface
- All devices sharing a single collision domain
Correct answer: All devices in the same VLAN
All devices in the same VLAN share one broadcast domain; switches by default do not contain broadcasts between VLANs.
Question 2: A port security violation in 'restrict' mode results in which behavior?
- Port shuts down with err-disabled state
- Frames are dropped and a syslog/SNMP notification is generated (Correct answer)
- Frames are dropped silently with no notification
- Port continues forwarding but logs a warning once only
Correct answer: Frames are dropped and a syslog/SNMP notification is generated
Restrict mode drops frames from violating MAC addresses and increments the security violation counter while sending syslog and SNMP notifications.
Question 3: Which store-and-forward switching characteristic makes it preferred in networks that require high reliability?
- Lowest latency of all switching methods
- Error checking using CRC before forwarding (Correct answer)
- Does not require a buffer
- Forwards frames before reading the source address
Correct answer: Error checking using CRC before forwarding
Store-and-forward switching receives the entire frame and performs a CRC check before forwarding, ensuring corrupted frames are never forwarded.
Question 4: Which command removes all dynamically learned MAC addresses from a Cisco switch's MAC address table immediately?
- no mac address-table dynamic
- clear mac address-table dynamic (Correct answer)
- delete mac address-table all
- flush mac address-table
Correct answer: clear mac address-table dynamic
'clear mac address-table dynamic' immediately removes all dynamically learned entries from the MAC address table.
Question 5: What is the purpose of the 'switchport nonegotiate' command on a Cisco switch port?
- Forces the port into trunk mode
- Disables DTP so the port does not send DTP frames (Correct answer)
- Sets the port to half-duplex
- Prevents VTP updates on the port
Correct answer: Disables DTP so the port does not send DTP frames
'switchport nonegotiate' disables DTP negotiation, preventing the port from sending or responding to DTP frames.
Question 6: On a switch, what does the term 'asymmetric switching' refer to?
- A switch that operates at both Layer 2 and Layer 3
- Switching between ports that have different bandwidth speeds (Correct answer)
- Forwarding frames using different methods per port
- Using multiple MAC address tables for different VLANs
Correct answer: Switching between ports that have different bandwidth speeds
Asymmetric switching provides switched connections between ports of unequal bandwidth, such as between 100 Mbps and 1 Gbps ports.
Question 7: Which Cisco IOS command statically adds a MAC address entry to the MAC address table for VLAN 10 on interface Fa0/1?
- mac address-table static 0011.2233.4455 vlan 10 interface fastethernet 0/1 (Correct answer)
- arp 0011.2233.4455 vlan 10 fa0/1
- switchport mac 0011.2233.4455 vlan 10
- add mac 0011.2233.4455 fa0/1 vlan 10
Correct answer: mac address-table static 0011.2233.4455 vlan 10 interface fastethernet 0/1
The 'mac address-table static' command manually creates a permanent MAC address entry, binding the address to a specific VLAN and interface.
Cisco CCNA Basic Switching Concepts 5
Which of the following correctly describes a broadcast domain in a switched network?