The network administrator is asked to ...

单项选择题The network administrator is asked to configure 113 point-to-point links.Which IP addressing scheme best defines the address range and subnet mask that meet the requirement and waste the fewest subnet and host addresses?（）

A. 10.10.0.0/18 subnetted with mask 255.255.255.252
B. 10.10.0.0/25 subnetted with mask 255.255.255.252
C. 10.10.0.0/24 subnetted with mask 255.255.255.252
D. 10.10.0.0/23 subnetted with mask 255.255.255.252
E. 10.10.0.0/16 subnetted with mask 255.255.255.252

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1.单项选择题Which component of VPN technology ensures that data can be read only by its intended recipient?（）

A. data integrity
B. encryption
C. key exchange
D. authentication

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2.单项选择题An administrator attempts a traceroute but receives a "Destination Unreadable" message. Which protocol is responsible for that message?（）

A. RARP
B. RUDP
C. ICMP
D. SNMP

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3.单项选择题When a host transmits data across a network to another host, which process does the data go through?（）

A. standardization
B. conversion
C. encapsulation
D. synchronization

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4.单项选择题A network admin wants to know every hop the packets take when he accesses cisco.com. Which command is the most appropriate to use?（）

A. path cisco.com
B. debug cisco.com
C. trace cisco.com
D. traceroute cisco.com

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5.单项选择题Which line from the output of the show ip interface command indicates a layer 1 problem?（）

A. Serial0/1 is up, line protocol is down
B. Serial0/1 is down, line protocol is down
C. Serial0/1 is up, line protocol is up
D. Serial0/1 is administratively down, line protocol is down

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6.单项选择题Which statement about IPv6 is true?（）

A. Addresses are not hierarchical and are assigned at random.
B. Only one IPv6 address can exist on a given interface.
C. There are 2.7 billion addresses available.
D. Broadcasts have been eliminated and replaced with multicasts.

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7.单项选择题Which statement about RIPng is true?（）

A. RIPng allows for routes with up to 30 hops.
B. RIPng is enabled on each interface separately.
C. RIPng uses broadcasts to exchange routes.
D. There can be only one RIPng process per router.

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8.单项选择题Which term describes the process of encapsulating IPv6 packets inside IPv4 packets?（）

A. tunneling
B. hashing
C. routing
D. NAT

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9.单项选择题What is the first 24 bits in a MAC address called?（）

A. NIC
B. BIA
C. OUI
D. VAI

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10.单项选择题When is it necessary to use a public IP address on a routing interface?（）

A. Connect a router on a local network.
B. Connect a router to another router.
C. Allow distribution of routes between networks.
D. Translate a private IP address.
E. Connect a network to the Internet.

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