● When a large packet wants to travel through a network whose MTU is too small, one solution is to allow routers to break up the packet into （）. （）A. messages B. frames C. fragments D. bits
● When a large packet wants to travel through a network whose MTU is too small, one solution is to allow routers to break up the packet into （）. （）A. messages B. frames C. fragments D. bits
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阅读下面的短文，回答问题 [When an IP packet arrives at a router, generally the router looks at the destination address of the packet, and forwards the packet to one of its network interfaces. The forwarding decision is usually done by looking up the destination address from another data structure called a forwarding table. The forwarding table is created by the router using the routing table and possible routing policies existing in the router. The router then creates a table where it lists which networks are accessible through which of the routers network interfaces. An IP router looks at every IP packet individually and does the forwarding decision on a packet-by-packet basis. If something changes in the routers routing table, a packet can take a different route from a preceding packet even if it has the same destination.] From the paragraph above，we can see that the router （ ） a forwarding table according to the routing table and possible routing policies existing in the router. When an IP packet arrives at a router, the （ ） part of packet is normally checked by the router. An IP router checks every IP Packet individually and makes the forwarding decision based on （ ）.A．is generating B．generate C．is generated D．generates A．forwarding table B．network interfaces C．routing policies D．destination address A．the destination address and network interfaces B．forwarding table and network interfaces C．the destination address and forward table D．routing policies and routing table
The number of home users and small businesses that want to use the Internet is ever increasing. The shortage of addresses is becoming a serious problem.A quick solution to this problem is called network address translation(NAT).NAT enables a user to have a large set of addresses（ ）and one address, or a smallset of addresses,externally. The traffic inside can use the large set; the traffic（ ）, the small set. To separate the addresses used inside the home or business and the ones used for the Internet, the Internet authorities have reserved three sets of addresses as（ ）addresses. Any organization can use an address out of this set without permission from the Internet authorities. Everyone knows that these reserved addresses are for private networks.They are（ ）inside the organization, but they are not unique globally. No router will（ ）a packet that has one of these addresses as the destination address.The site must have only one single connection to the global Internet through a router that runs the NAT software.A.absolutelyB.completelyC.internallyD.externallyA.localB.outsideC.middleD.aroundA.privateB.commonC.publicD.externalA.uniqueB.observableC.particularD.ordinaryA.rejectB.receiveC.denyD.forward请帮忙给出每个问题的正确答案和分析，谢谢！
Which of the following network types is being described when computers are connected so thatdata flows from one computer to the other by traveling through each computer in the network?() A. StarB. HybridC. MeshD. Ring
An administrator wants to test the network MTU. Which of the following commands allows differentsize packets to be sent?() A.netstatB.tracerouteC.nbtstatD.ping
Packet-switching wireless networks are preferable(66)when transmissions are(67)bemuse of the way charges are(68)per packet. Circuit-switched networks are preferable for transferring large files or for other lengthy transmissions because customers are(69)for the(70)of time they use the network.A．toB．forC．thanD．only
Router R1, a branch router, connects to the Internet using DSL. Some traffic flows through a GRE and IPsec tunnel, over the DSL connection, destined for an Enterprise network.Which of the following answers best describes the router‘s logic that tells the router, for a given packet, to apply GRE encapsulation to the packet?（）A. When the packet received on the LAN interface is permitted by the ACL listed on the tunnel greacl command under the incoming interfaceB. When routing the packet, matching a route whose outgoing interface is the GRE tunnel interfaceC. When routing the packet, matching a route whose outgoing interface is the IPsec tunnel interfaceD. When permitted by an ACL that was referenced in the associated crypto map
The number of home users and small businesses that want to use the Internet is ever increasing. The shortage of addresses is becoming a serious problem. A quick solution to this problem is called network address translation(NAT).NAT enables a user to have a large set of addresses（ ）and one address, or a smallset of addresses,externally. The traffic inside can use the large set; the traffic（ ）, the small set. To separate the addresses used inside the home or business and the ones used for the Internet, the Internet authorities have reserved three sets of addresses as （ ） addresses. Any organization can use an address out of this set withoutpermission from the Internet authorities. Everyone knows that these reserved addresses are for private networks.They are （ ） inside the organization, but they are not unique globally. No router will （请作答此空） a packet that has one of these addresses as the destination address.The site must have only one single connection to the global Internet through a router that runs the NAT software.A.rejectB.receiveC.denyD.forward
What is the purpose using the traceroute command?（）A、to map all the devices on a network.B、to display the current TCP/IP configuration values.C、to see how a device MAC address is mapped to its IP address.D、to see the path a packet will take when traveling to a specified destination.E、to display the MTU values for each router in a specified network path from source to a destination.
Router R1, a branch router, connects to the Internet using DSL. Some traffic flows through a GRE and IPsec tunnel, over the DSL connection, destined for an Enterprise network. Which of the following answers best describes the router's logic that tells the router, for a given packet, to apply GRE encapsulation to the packet?（）A、When the packet received on the LAN interface is permitted by the ACL listed on the tunnel greacl command under the incoming interfaceB、When routing the packet, matching a route whose outgoing interface is the GRE tunnel interfaceC、When routing the packet, matching a route whose outgoing interface is the IPsec tunnel interfaceD、When permitted by an ACL that was referenced in the associated crypto map
How does an IPv6 router deal with a packet that is larger than the outgoing interface MTU？（）A、It will fragment the packet at Layer 2.B、It will fragment the packet at Layer 3.C、It will drop the packet and send an ICMPv6 message "packet too big" back to the source.D、It will drop the packet.
You need to troubleshoot some problems in the Company VOIP network associated with jitter. What is the cause of jitter？ （）A、 Packet dropsB、 Transmitting too many small packetsC、 Variable queue delaysD、 CompressionE、 None of the other alternatives apply
Which of the following statements regarding routed and routing protocols are true?（）A、A routed protocol is assigned to an interface and determines the method of packet deliver.B、A routing protocol determines the path of a packet through a network.C、A routed protocol determines the path of a packet through a network.D、A routing protocol operates at the transport layer of the OSI model.E、A routed protocol updates the routing table of a router.
Jitter is causing problems with the VOIP application in the network. What causes network jitter？（）A、Variable queue delaysB、Packet dropsC、Transmitting too many small packetsD、Compression
Jitter is causing problems with the VOIP application in the Company network. What causes network jitter？（）A、Variable queue delaysB、Packet dropsC、Transmitting too many small packetsD、Compression
What is a static packet-filtering firewall used for ？（）A、It validates the fact that a packet is either a connection request or a data packet belonging to a connectionB、It evaluates network packets for valid data at the application layer before allowing connectionsC、It analyzes network traffic at the network and transport protocol layersD、It keeps track of the actual communication process through the use of a state table
A Network Engineer is reporting that one of the AIX hosts is generating too much ICMP traffic, which is slowing the network. Which of the following options is the most probable cause?（）A、A large FTP job is in process. B、A network interface was misconfigured. C、The ping command is being used excessively. D、A bad network interface card and/or network cable is in use.
Which of the following network types is being described when computers are connected so thatdata flows from one computer to the other by traveling through each computer in the network?（）A、StarB、HybridC、MeshD、Ring
An administrator wants to test the network MTU. Which of the following commands allows differentsize packets to be sent?（）A、netstatB、tracerouteC、nbtstatD、ping
For IKE phase 1 negotiations， when is aggressive mode typically used？（）A、when one of the tunnel peers has a dynamic IP addressB、when one of the tunnel peers wants to force main mode to be usedC、when fragmentation of the IKE packet is required between the two peersD、when one of the tunnel peers wants to specify a different phase 1 proposal
单选题customer wants to network several computers within a large warehouse. The warehouse has one computer at the very far end of the warehouse that is 170 meters (557 feet) from the network switch. Which of the following cable types should a technician use for this computer?（）ACAT3BCAT5CCAT6DFiber
单选题You need to troubleshoot some problems in the Company VOIP network associated with jitter. What is the cause of jitter？ （）A Packet dropsB Transmitting too many small packetsC Variable queue delaysD CompressionE None of the other alternatives apply
单选题As to the bearing, of the following, which statement is not true?（）Aff overheat is found, the engine must be stopped for inspectionBMuch heat of the crankcase door indicates that the bearing is overheatedCIf bearing clearance is too large, knocking will be heard in the crankcaseDIf bearing clearance is too large or too small, the white metal may be melted
单选题How does an IPv6 router deal with a packet that is larger than the outgoing interface MTU？（）AIt will fragment the packet at Layer 2.BIt will fragment the packet at Layer 3.CIt will drop the packet and send an ICMPv6 message packet too big back to the source.DIt will drop the packet.
单选题A Network Engineer is reporting that one of the AIX hosts is generating too much ICMP traffic, which is slowing the network. Which of the following options is the most probable cause?（）AA large FTP job is in process. BA network interface was misconfigured. CThe ping command is being used excessively. DA bad network interface card and/or network cable is in use.
单选题Router R1, a branch router, connects to the Internet using DSL. Some traffic flows through a GRE and IPsec tunnel, over the DSL connection, destined for an Enterprise network. Which of the following answers best describes the router's logic that tells the router, for a given packet, to apply GRE encapsulation to the packet?（）AWhen the packet received on the LAN interface is permitted by the ACL listed on the tunnel greacl command under the incoming interfaceBWhen routing the packet, matching a route whose outgoing interface is the GRE tunnel interfaceCWhen routing the packet, matching a route whose outgoing interface is the IPsec tunnel interfaceDWhen permitted by an ACL that was referenced in the associated crypto map
单选题For IKE phase 1 negotiations， when is aggressive mode typically used？（）Awhen one of the tunnel peers has a dynamic IP addressBwhen one of the tunnel peers wants to force main mode to be usedCwhen fragmentation of the IKE packet is required between the two peersDwhen one of the tunnel peers wants to specify a different phase 1 proposal
单选题When action to avoid a close quarter situation is taken,a course change alone may be the most effective action provide that（）.Ait is done in a succession of small course changesBIt is not done too earlyCIt is a large course changeDthe course change is to starboard