Switch Fundamentals: MAC Address Table and Learning

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What is the purpose of memory buffering on Ethernet switches?

To allocate a fixed amount of buffer memory to each port
To prioritize frames based on their destination ports
To enable autonegotiation of duplex settings
To store frames before forwarding them or when the destination port is busy (correct)

What happens to frames in a port-based memory buffering system?

They are lost if the destination port is busy
They are stored in queues linked to specific incoming and outgoing ports (correct)
They are stored in a common memory buffer shared by all switch ports
They are transmitted immediately without delay

What is the primary function of autonegotiation?

To enable duplex mismatch detection
To enable full-duplex communication on all Ethernet links
To allocate bandwidth to each port on a switch
To automatically negotiate the best speed and duplex capabilities (correct)

What is a duplex mismatch?

A common cause of performance issues on 10/100 Mbps Ethernet links (B) Signup and view all the answers

What is a characteristic of full-duplex communication?

Both ends of the connection can send and receive simultaneously (C) Signup and view all the answers

What is a characteristic of Gigabit Ethernet ports?

They always operate in full-duplex mode (A) Signup and view all the answers

What is the term used to refer to the MAC address table in a switch?

Content Addressable Memory (CAM) table (B) Signup and view all the answers

What happens when a switch receives a frame with a destination MAC address that is not in the MAC address table?

The switch forwards the frame out all ports except the incoming port (A) Signup and view all the answers

How does a switch learn about new MAC addresses?

By examining the source MAC address of the frame and the port number where the frame entered the switch (C) Signup and view all the answers

What is the term for a frame that is sent to all ports on a switch except the incoming port?

Unknown unicast (D) Signup and view all the answers

What is the purpose of the MAC address table in a switch?

To forward frames to their destination (C) Signup and view all the answers

What happens when a switch is first turned on?

The MAC address table is empty (D) Signup and view all the answers

What is the maximum number of bits used in an IPv6 address?

128 (A) Signup and view all the answers

How many hexadecimal values are in a total IPv6 address?

32 (D) Signup and view all the answers

What is the minimum number of bits required to represent a decimal number in binary?

It depends on the decimal number (D) Signup and view all the answers

What is the purpose of the binary positional value table?

To convert decimal to binary (D) Signup and view all the answers

How are hexadecimal digits represented in an IPv6 address?

Every 4 bits is represented by a single hexadecimal digit (C) Signup and view all the answers

What is the first step in converting a decimal number to binary?

Start in the 128 position (A) Signup and view all the answers

What is the result of 1 AND 0 in a logical AND operation?

0 (B) Signup and view all the answers

What is the purpose of the prefix length in subnet mask?

To count the number of bits set to 1 in the subnet mask (D) Signup and view all the answers

What is the first IP address that can be issued to a host?

The one immediately following the network address (B) Signup and view all the answers

What is the primary difference between public and private IPv4 addresses?

Private addresses are not unique and can be used internally (C) Signup and view all the answers

What is the term for sending a packet to a specific group of IP addresses?

Multicast transmission (D) Signup and view all the answers

How can an IP address be assigned to a host?

Either manually or dynamically through DHCP (B) Signup and view all the answers

What is the primary difference between classful and classless networks?

Classful networks have a fixed number of bits allocated to the network element, while classless networks do not (C) Signup and view all the answers

What is the primary purpose of CIDR?

To escape from default subnet masks, thus allowing for more flexibility in sizing networks (D) Signup and view all the answers

What is the purpose of the subnet mask in an IPv4 address?

To identify the network and host portions of the address (D) Signup and view all the answers

What is the process used to identify the network and host portions of an IPv4 address?

Logical AND operation (C) Signup and view all the answers

What is a subnet in the context of computer networks?

A smaller network within a larger network (D) Signup and view all the answers

What is the purpose of classes D and E in IP addressing?

To provide additional attributes to classes A, B, and C (D) Signup and view all the answers