A legacy network that is prone to erro...

多项选择题A legacy network that is prone to errors may have issues with services that use UDP. Which of the following services could have problems in this case, due to the fact that UDP is used?（）

A.DNS
B.Telnet
C.SMTP
D.SNMP
E.HTTP
F.TFTP

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1.单项选择题The corporate head office of TestKing has a teleconferencing system that uses VOIP (voice over IP) technology. This system uses UDP as the transport for the data transmissions. If these UDP datagrams arrive at their destination out of sequence,what will happen?（）

A. UDP will send an ICMP Information Request to the source host.
B. UDP will pass the information in the datagrams up to the next OSI layer in the order that they arrive.
C. UDP will drop the datagrams.
D. UDP will use the sequence numbers in the datagram headers to reassemble the data in the correct order.
E. UDP will not acknowledge the datagrams and wait for a retransmission of the datagrams.

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2.多项选择题Although TCP segments differ from UDP segments, they both contain some common fields. What two segments do they share in common?（）

A. source address
B. options
C. sequence number
D. sources
E. destination port
F. checksum

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3.多项选择题Which of the following protocols utilize TCP?（）

A. NTP
B. NNTP
C. SMTP
D. SNMP
E. HTTPS
F. TFTP

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4.单项选择题Which one of the following protocols uses both UDP and TCP ports for the transport layer operation?（）

A.FTP
B.TFTP
C.SMTP
D.Telnet
E.DNS

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5.多项选择题Which of the following protocols utilize UDP as the layer 4 transport mechanism?（）

A.TACACS
B.Telnet
C.SMTP
D.SNMP
E.HTTP
F.TFTP

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6.多项选择题Which of the protocols below use TCP at the transport layer?（）

A.TFTP
B.SMTP
C.SNMP
D.FTP
E.HTTP
F.HTTPS

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7.单项选择题You have just configured a static default route on router TK1. What is the purpose of a default route?（）

A. It is a route to be used when the routing protocol fails.
B. It is a route configured by an ISP that sends traffic into a corporate network.
C. It is a route used when a packet is destined for a remote network that is not listed in the routing table.
D. It is a route manually configured for a specific remote network for which a routing protocol is not configured.
E. It is used to send traffic to a stub network.

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8.多项选择题Some of the TestKing routers have been configured with default routes. What are some of the advantages of using default routes?（）

A. They establish routes that will never go down.
B. The keep routing tables small.
C. They require a great deal of CPU power.
D. The allow connectivity to remote networks that are not in the routing table.
E. They direct traffic from the Internet into corporate networks.

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9.单项选择题How does route poisoning work with holddown timers to prevent routing loops?（）

A. Information learned from one source is not distributed back to that source.
B. Routing updates from the poisoned source are ignored until a holddown timer expires.
C. Failed routes are advertised with infinite metrics.
D. New routing updates are ignored until the network has converged.
E. A route is marked as unavailable when its time-to-live is exceeded.

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10.单项选择题What does a router do if it has no EIGRP feasible successor route to a destination network and the successor route to that destination network is inactive status?（）

A. It routes all traffic that is addresses to the destination network to the interface indicates in the routing table.
B. It sends a copy of its neighbor table to all adjacent routers.
C. It sends a multicast query packet to all adjacent neighbors requesting available routing paths to the destination network.
D. It broadcasts Hello packets to all routers in the network to re-establish neighbor adjacencies.

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