The Company is concerned about Layer 2 security threats.  Which statement is true about these  threats？ （）

A . When at anchor，the pilot vessel is only required to sound anchor signals B . The identification signal must be sounded any time the pilot vessel is underway C . The pilot vessel may only sound the identity signal when making way D . All of the above

A .  ARP spoofing attacks are attempts to redirect traffic to an attacking host by encapsulating a  false 802.1Q header on a frame and causing traffic to be delivered to the wrong VLAN. B .  ARP spoofing attacks are attempts to redirect traffic to an attacking host by sending an ARP  message with a forged identity to a transmitting host. C .  MAC address flooding is an attempt to force a switch to send all information out every port byoverloading the MAC address table. D .  ARP spoofing attacks are attempts to redirect traffic to an attacking host by sending an ARP  packet that contains the forged address of the next hop router. E .  MAC address flooding is an attempt to redirect traffic to a single port by associating that port  with all MAC addresses in the VLAN.

A .  Attacks are prevented by utilizing the port-security feature. B .  An end station attempts to gain access to all VLANs by transmitting Ethernet frames in the  802.1q encapsulation. C .  Configuring an interface with the switchport mode dynamic command will prevent VLAN  hopping. D .  An end station attempts to redirect VLAN traffic by transmitting Ethernet frames in the 802.1q  encapsulation. E .  Configuring an interface with the "switchport mode access" command will prevent VLAN  hopping.

A . Class 8 B . Class 3 - flammable liquid C . Division 2.2 - nonflammable gas D . All of the above are correct

A . All maintenance personnel have full access to all records. B . All maintenance personnel have read-only access to all data.  C . Only a very limited number of personnel have full access to static data records, but all maintenance personnel are able to enter work order data. D . Maintenance personnel should not be using the system, and should only write entries on printed work orders and hire input clerks to enter these into the system.

A . relieving the patient's pain by giving aspirin or stronger medication B . avoiding possible injury to the spinal cord by incorrect handling C . preventing convulsions and muscle spasms caused by the pain D . providing enough fluids to prevent dehydratio

A . The voltage drop across each resistor is the same B . The total current flow equals the reciprocal of the sum of the individual currents C . The total resistance equals the sum of the individual resistances D . The total voltage equals the sum of the individual voltages across each resistance

A . Customs B . Immigration C . Public Health D . MSA

A . Anchoring in the presence of ice is not recommended except in an emergency B . Towing a vessel through an ice field is not recommended except in an emergency C . The "Free and Proceed" system of escorting a beset vessel cuts down on the number of freeing operations D . When anchoring in ice，it is advisable to increase the scope of the chain over what is normally used for non-icing conditio

A . is stateless with global referencing of metadata B . is based on cluster architecture with externally provided quorum disks C . is based on cluster architecture, with quorum held internally on the first cluster node D . is based on grid architecture, with each node holding a full mirror configuration for all other node

A . It is lower than the ignition temperature B . It is the temperature at which a substance will spontaneously ignite C . It is the temperature at which a substance, when ignited, will continue to bum D . It is the temperature at which the released vapors will fall within the explosive range

A . at the right-hand end of the spine. B . at the end of the diagonal line (i.e. "fin"). C . on a branch of a fin. D . at the left-hand end of the spine. E . None of the above.

A.Individualism and cooperation．． B.Academic Success and independent thinkin9． C.Socialization and feeling of competence． D.Intelligence and respect．

A．management B．liquidity C．market value D．profitability

A、Mutual mistake of value B、Mutual mistake of material fact C、Elementary unilateral mistake D、Fraud by concealment

&8226;Write a memo to all your staff: &8226;informing them of the visit &8226;telling them why the visitor is coming &8226;telling them when he will arrive and asking them to be at the welcome reception for him. &8226;Write 40-50 words.

A、The carrying amounts of inventories carried at fair value less costs to sell B、The amount of the reversal of any write-down of inventories C、The amount of inventories recognized as an expense during the period

A. The laptop is missing the software supplicant B. The access point SSID is hidden. C. The laptop only supports TKIP and AES encryption, D. The access point is on the wrong channel.

A．A.cat B．B.dog C．C.elephant D．D.bear

是 否

A．工人 B．会计 C．经理