TCP resides on what layer of the OSI model? Correct Answer: Transport, Layer 4
How many Bytes are in the Flag of an HDLC frame? Correct Answer: 1
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What is a HDLC frame? Correct Answer: High-level Data Link Control (HDLC) is a group of communication protocols of the data link layer for transmitting data between network points or nodes. Since it is a data link protocol, data is organized into frames. A frame is transmitted via the network to the destination that verifies its successful arrival. It is a bit - oriented protocol that is applicable for both point - to - point and multipoint communications.
What portion of the MAC address indicates the originating networking equipment vendor? Correct Answer: The 1st octet or the first 8 bits.
What is FCS in a frame? Correct Answer: Frame Check Sequence (FCS) is an error-detecting code.
What is the SFD field of an Ethernet frame? Correct Answer: The SFD (start frame delimiter) is the eight-bit (one-byte) value that marks the end of the preamble.
What are the different fields of a 802.11 MAC frame? Correct Answer: FC (frame control, 2 bytes) | DUR (duration, 2 bytes) | ADD1 (6 bytes) | ADD2 (6 bytes) | ADD3 (6 bytes) | SEQ (Sequence, 2 bytes) | ADD4 (6 bytes) | DATA (size varies) | FCS (frame check sequence, 4 bytes CRC value)
Why would a physical interface on a switch display the following:
Line Status: down
Interface Status: down (err-disabled)
Interface Status: err-disabled Correct Answer: Port security has disabled the interface.
What parameters are used when connecting to the console of a Cisco switch? Correct Answer: 9600 (speed), None (parity), 8 (data bits), 1 (stop bits), None (flow control)
What commands will erase NVRAM? Correct Answer: erase nvram (preferred), write erase and erase startup
The password required to login to user mode through a console is called? Correct Answer: console password
What commands will add a switch interface to vlan 20? Correct Answer: switchport mode access
switchport access vlan 20
What is a runt frame and what is it likely caused by? Correct Answer: A runt frame is an Ethernet frame that is less than the IEEE 802.3's minimum length of 64 octets and has a bad FCS value (frame check sequence). Runt frames are most commonly caused by collisions.
What happens to runt frames received by a Cisco Ethernet switch? Correct Answer: The frame is dropped.
What is STP? Correct Answer: Spanning Tree Protocol (STP) is a link management protocol that provides path redundancy while preventing undesirable loops in the network.
What is the correct order for STP? Correct Answer: 1. Elect a root bridge
2. Elect a root port for each non-root bridge
3. Elect a designated port for each segment.
4. Root ports and designated ports transition to the forwarding state.
What command would be used to define the native VLAN for a truck port? Correct Answer: switchport trunk native vlan [vlan-id]
What is the command to configure a truck port? Correct Answer: 3. switchport mode trunk
What is a Ethernet giant frame? Correct Answer: One that is larger than 1,518 bytes and has a bad FCS (frame check sequence) value.
How can you calculate the number of hosts in a subnet? Correct Answer: Using 2^n-2, where n is the number of 0 in the subnet mask.
Example: /21 or 255.255.248.0 would be 11111111.11111111.11111000.00000000. There are 11 zeroes, so it would be 2^11-2=2,046. There would be 2,046 hosts in each subnet.
What command should you issue on a switch port so that no more than two devices can send traffic into the port? Correct Answer: [Show Less]