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NEW QUESTION: 1
How many bits of a MAC address uniquely identify a vendor, as provided by the IEEE?
A. 24 bits
B. 12 bits
C. 16 bits
D. 6 bits
Answer: A
Explanation:
Explanation/Reference:
The MAC address is 48 bits long, 24 of which identify the vendor, as provided by the IEEE. The other 24 bits are provided by the vendor.
A media access control address (MAC address) is a unique identifier assigned to network interfaces for communications on the physical network segment. MAC addresses are used for numerous network technologies and most IEEE 802 network technologies, including Ethernet. Logically, MAC addresses are used in the media access control protocol sublayer of the OSI reference model.
MAC addresses are most often assigned by the manufacturer of a network interface card (NIC) and are stored in its hardware, such as the card's read-only memory or some other firmware mechanism. If assigned by the manufacturer, a MAC address usually encodes the manufacturer's registered identification number and may be referred to as the burned-in address. It may also be known as an Ethernet hardware address (EHA), hardware address or physical address. This is can be contrasted to a programmed address, where the host device issues commands to the NIC to use an arbitrary address. An example is many SOHO routers, where the ISP grants access to only one MAC address (used previously to inserting the router) so the router must use that MAC address on its Internet-facing NIC. Therefore the router administrator configures a MAC address to override the burned-in one.
A network node may have multiple NICs and each must have one unique MAC address per NIC.
See diagram below from Wikipedia showing the format of a MAC address. :
MAC Address format

Reference(s) used for this question:
http://en.wikipedia.org/wiki/MAC_address

NEW QUESTION: 2
During which STP state can ports add information to their address tables, but not send any data?
A. Forwarding
B. Learning
C. Listening
D. Blocked
Answer: B
Explanation:
Explanation/Reference:
Explanation:
In the learning state, a switch port can add learned information into its address table, but cannot forward
data.
Spanning tree transitions each port through several states whenever there is a change in the network
topology to prevent switching loops. Each state is briefly defined as follows:
Blocking: In the blocking state, a port does not forward frames, learn information, or send out information.
A forwarding port is placed in the blocked state when the port senses an absence of BPDUs, which are
sent out in the interval defined by the hello time (two seconds by default). If the blocked port does not
detect a BPDU for the length of time defined in the max-age setting (20 seconds by default), the port will
transition into the listening state.
Listening: In the listening state, a port receives traffic, but does not send information. This is the first
transitional state after the blocking state. No user data is forwarded at this time, but the switch is very busy.
It is during this stage that the switch participates in the election of the root bridge, the root ports on the non-
root bridges, and the designated ports on each segment. Ports that remain as designated or root ports will
transition to the learning state after the time defined in the forward delay (15 seconds by default) has
elapsed.
Learning: In the learning state, a switch port can add the MAC addresses that it has learned into its
address table but cannot forward user data. The switch port will remain in this state until the amount of
time defined in the forward-delay setting has elapsed (15 seconds by default), at which time it will transition
into the forwarding state.
Forwarding: In the forwarding state, a port is actively forwarding packets. It will remain in the forwarding
state until it does not detect a BPDU within the defined hello time, at which time the port is placed in the
blocking state and the process starts again.
Objective:
Layer 2 Technologies
Sub-Objective:
Configure and verify spanning tree
References:
Catalyst 6500 Release 12.2SXF and Rebuilds Software Configuration Guide > Configuring STP and IEEE
802.1s MST > Creating the Spanning Tree Topology
Cisco > Support > Configuring Spanning Tree Protocol > How STP Works

NEW QUESTION: 3
Which Gigabit Ethernet media type provides the longest reach without a repeater?
A. 1000Base-SX
B. 1000Base-CX
C. 1000Base-LX
D. 1000Base-T
Answer: C

NEW QUESTION: 4
DRAG DROP


Answer:
Explanation: