单选题（）the time of collision，the 3rd officer was on the bridge．AAtBOnCOfDIn
单选题
（）the time of collision，the 3rd officer was on the bridge．
A
At
B
On
C
Of
D
In
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On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously, resulting in a collision. Following this collision, what will the hosts do? (Select all valid answers)A. The destination host sends a request to the source for retransmission.B. The jam signal indicates that the collision has been cleared.C. The hosts will attempt to resume transmission after a time delay has expired.D. An electrical pulse indicates that the collision has cleared.E. The router on the segment will signal that the collision has cleared.F. The hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.
Two stations on the Ezonexam LAN transmit at the same time, resulting in a collision. What happens when a collision occurs on the network? (Choose all that apply)A．Each device on the Ethernet segment stops transmitting for a short time.B．A jam signal informs all devices that a collision occurred.C．When data transmission resumes, the devices that were involved in the collision have priority to transmit.D．The devices that are involved in the collision stops transmitting for a short time.E．The collision invokes a random back-off algorithm.
A vessel has sustained damage in a collision with another vessel. It is necessary to have a Seaworthy Certificate before the vessel sails. Who will issue this certificate?A.American ConsulB.Classification SocietyC.Captain of the PortD.Officer in Charge Marine Inspection
At the same time，it is ______ for you to signify your acknowledgement of the responsibility for the collision by signing the copies of this letter hereto attached and to return me two copies in due time.A.essentialB.importantC.goodD.a better operation
A ship must report a collision with an aid to navigation maintained by the Coast Guard to which office?A.Nearest Oceanographic officeB.The Marine Safety Center at Coast Guard HeadquartersC.National Ocean ServiceD.Nearest Officer in Charge，Marine Inspection
If at any time the officer in charge of the navigational watch is to be relieved when a manoeuvre or other action to avoid any hazard is taking place，______．A.the relief of that officer shall be made prior to such action has been completedB.the relief of that officer shall never be madeC.the relief of that officer shall be deferred until such action has been completedD.the relief of that officer shall be made by the captain
On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously,resulting in a collision. Following this collision, what will the hosts do?（）A、The destination host sends a request to the source for retransmission.B、The jam signal indicates that the collision has been cleared.C、The hosts will attempt to resume transmission after a time delay has expired.D、An electrical pulse indicates that the collision has cleared.E、The router on the segment will signal that the collision has cleared.F、The hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.
Which statement is true regarding an Ethernet collision domain?（）A、If a router is used, the collision domain includes all devices connected to the router.B、If a hub is used, the collision domain is limited to each device and the hub.C、If a switch is used, the collision domain is limited to each device and the switch.D、If a bridge is used, the collision domain includes all devices connected to the bridge.
Every deck officer should be able efficiently carry out：（）A、ConningB、Navigation/Collision AvoidanceC、AdministrationD、Above of all
Two stations on a LAN transmit at the same time, resulting in a collision. What happens when a collision occurs on the network?（）A、Each device on the Ethernet segment stops transmitting for a short time.B、A jam signal informs all devices that a collision occurred.C、When data transmission resumes, the devices that were involved in the collision have priority to transmit.D、The devices that are involved in the collision stops transmitting for a short time.E、The collision invokes a random back-off algorithm.
单选题A ship must report a collision with an aid to navigation maintained by the Coast Guard to which office?（）ANearest Oceanographic officeBThe Marine Safety Center at Coast Guard HeadquartersCNational Ocean ServiceDNearest Officer in Charge，Marine Inspection
单选题The officer of the watch should（）comply with the collision rules.Asome timesBoftenCat all timesDseldom
单选题You are in charge of a stand-on vessel in a crossing situation.The other vessel is 1.5 miles to port.You believe that risk of collision exists.You should（）.Atake avoiding action immediately upon determining that risk of collision existsBimmediately sound the danger signalCtake avoiding action only after providing the give-way vessel time to take action ,and determining that her action is not appropriateDhold course and speed until the point of extremis, and then sound the danger signal, taking whatever action will best avert collision
单选题If necessary to avoid collision or allow more time to（）the situation，a vessel shall slacken her speed or take all way off by stopping or reversing her means of propulsion．AaccessBprocessCprofessDrecess
多选题Two devices on an Ethernet segment sent frames at the same time causing a collision. Which two statements are true?（）ABoth devices stop transmitting, wait a random period of time, verify the wire is idle, and re- transmit.BThe device with the lowest MAC address is permitted to retransmit first.CThe device with the lowest MAC address sends a jam signal to notify all other devices of the collision.DBoth devices send a jam signal to notify all other devices of the collision.
多选题Two devices on an Ethernet segment sent frames at the same time causing a collision. Which twostatements are true?（）ABoth devices stop transmiting, wait a random period of time, verify the wire is idle, and re-transmitBThe device with the lowest MAC address is permitted to retrannsmit firstCThe device with the lowest MAC address sends a jam signal to notify all other devices of the collisionDBoth devices send a jam signal to notify all other devices of the collision
单选题The officer in charge of the navigational watch shall not hand over the watch to the relieving officer if（）.Athere is reason to believe that the latter is not capable of carrying out the watchkeeping duties effectivelyBthe ship is fitted with automatic steeringCthere is daylight or darknessDat no time shall the bridge be left unattended
单选题Every deck officer should be able efficiently carry out：（）AAdministration；BNavigation/Collision Avoidance；CConning；DAbove of all.
单选题Which statement is true regarding an Ethernet collision domain?（）AIf a router is used, the collision domain includes all devices connected to the router.BIf a hub is used, the collision domain is limited to each device and the hub.CIf a switch is used, the collision domain is limited to each device and the switch.DIf a bridge is used, the collision domain includes all devices connected to the bridge.
单选题The responsibility for maintaining the Official Logbook on voyages between the Atlantic and Pacific coasts of the United States rests with the（）.AChief Mate of the vesselBMaster of the vesselCDeck Officer of the watch at the time of the occurrenceDPurser of the vessel
单选题On a half-duplex Ethernet LAN, two hosts attempt to send data simultaneously,resulting in a collision. Following this collision, what will the hosts do?（）AThe destination host sends a request to the source for retransmission.BThe jam signal indicates that the collision has been cleared.CThe hosts will attempt to resume transmission after a time delay has expired.DAn electrical pulse indicates that the collision has cleared.EThe router on the segment will signal that the collision has cleared.FThe hosts will do nothing, as the higher layers are responsible for data error correction and re-transmission.
单选题Any action（）collision shall，if the circumstances of the case admit，made in ample time and with due regard to the observance of good seamanship.Ataking to avoidBtaking to avoidingCtaken to avoidDtaken to avoiding
单选题Any action taken to avoid collision shall，if the circumstances of the case admit，（）.Abe positiveBbe positive and made in ample timeCbe positive，made in ample time and with due regard to the observance of good seamanshipDbe positive，made in ample time，with due regard to the observance of good seamanship and avoiding complying with local regulations
单选题Any action to avoid collision shall,if the circumstances of the case admit,（）,made in ample time and with due regard to the observance of good seamanship.Abe initiativeBbe positiveCbe negativeDbe positively
单选题At the same time，it is（）for you to signify your acknowledgement of the responsibility for the collision by signing the copies of this letter hereto attached and to return me two copies in due time.AessentialBimportantCgoodDa better operation
多选题Two devices on an Ethernet segment sent frames at the same time causing a collision. Which two statements are true?（）ABoth devices stop transmiting, wait a random period of time, verify the wire is idle, and re-transmitBThe device with the lowest MAC address is permitted to retrannsmit firstCThe device with the lowest MAC address sends a jam signal to notify all other devices of the collisionDBoth devices send a jam signal to notify all other devices of the collision