第五单元1窗体顶端In an IPv4 environment, what information is used by the router to forward data packets from one interface of a router to another? destination network address source network address source MAC address well known port destination address 窗体底端2窗体顶端What information is added during encapsulation at OSI Layer 3? source and destination MAC source and destination application protocol source and destination port number source and destination IP address 窗体底端3窗体顶端In a connectionless system, which of the following is correct? The destination is contacted before a packet is sent. The destination is not contacted before a packet is sent. The destination sends an acknowledgement to the source that indicates the packet was received. The destination sends an acknowledgement to the source that requests the next packet to be sent. 窗体底端4Which IP packet field will prevent endless loops? type-of-service identification flags time-to-live header checksum 5Which portion of the network layer address does a router use to forward packets? host portion broadcast address network portion gateway address 6窗体顶端Refer to the exhibit. Using the network in the exhibit, what would be the default gateway address for host A in the 192.133.219.0 network? 192.135.250.1 192.31.7.1 192.133.219.0 192.133.219.1 窗体底端7窗体顶端If the default gateway is configured incorrectly on the host, what is the impact on communications? The host is unable to communicate on the local network. The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks. The host can communicate with other hosts on remote networks, but is unable to communicate with hosts on the local network. There is no impact on communications. 窗体底端8窗体顶端What is the purpose of a default gateway? physically connects a computer to a network provides a permanent address to a computer identifies the network to which a computer is connected identifies the logical address of a networked computer and uniquely identifies it to the rest of the network identifies the device that allows local network computers to communicate with devices on other networks 窗体底端9窗体顶端What type of routing uses information that is manually entered into the routing table? dynamic interior static standard 窗体底端10窗体顶端When the destination network is not listed in the routing table of a Cisco router, what are two possible actions that the router might take? (Choose two.) The router sends an ARP request to determine the required next hop address. The router discards the packet. The router forwards the packet toward the next hop indicated in the ARP table. The router forwards the packet to the interface indicated by the source address. The router forwards the packet out the interface indicated by the default route entry. 窗体底端11窗体顶端What are the key factors to consider when grouping hosts into a common network? (Choose three.) gateways purpose physical addressing software version geographic location ownership 窗体底端12窗体顶端What is a component of a routing table entry? the MAC address of the interface of the router the destination Layer 4 port number the destination host address the next-hop address 窗体底端13窗体顶端Which intermediary devices could be used to implement security between networks? (Choose two.) router hub switch firewall access point bridge窗体底端14窗体顶端What are three common problems with a large network? (Choose three.) too few broadcasts performance degradation security issues limited management responsibility host identification protocol compatibility 窗体底端15窗体顶端Refer to the exhibit. All devices shown in the exhibit have factory default settings. How many broadcast domains are represented in the topology that is shown? 3 4 5 7 8 11 窗体底端16窗体顶端Which three statements are true about routes and their use? (Choose three.) If no route to the destination network is found, the packet is returned to the previous router. If the destination network is directly connected, the router forwards the packet to the destination host. If multiple network entries exist for the destination n