Basic Switching Concepts Flashcards
7 cards from real Cisco CCNA practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Basic Switching Concepts flashcards as text
How does a switch build its MAC address table?
Answer: By reading the source MAC address of incoming frames
A switch learns MAC addresses by examining the source MAC address field of frames received on each port and recording the port association.
What is the default aging time for dynamic MAC address entries on a Cisco switch?
Answer: 300 seconds
Cisco switches default to a 300-second (5-minute) aging timer for dynamically learned MAC address table entries.
Which switching method reads only the first 64 bytes of a frame before forwarding?
Answer: Fragment-free
Fragment-free switching reads the first 64 bytes to check for collision fragments before forwarding, balancing error detection and latency.
On a Cisco switch, which command displays the MAC address table?
Answer: show mac address-table
The 'show mac address-table' command displays all learned, static, and secure MAC address entries on a Cisco switch.
A switch port is in full-duplex mode. Which statement is true?
Answer: The port can send and receive simultaneously
Full-duplex ports use separate transmit and receive paths, allowing simultaneous bidirectional communication and eliminating collisions.
What does the 'switchport mode access' command configure on a Cisco switch port?
Answer: Forces the port to belong to a single VLAN and not negotiate trunking
'switchport mode access' statically sets the port as an access port carrying only one VLAN and disables DTP negotiation.
Which protocol can cause a loop-free Layer 2 topology by blocking redundant paths?
Answer: Spanning Tree Protocol (STP)
Spanning Tree Protocol (STP) prevents Layer 2 loops by placing redundant switch ports into a blocking state.