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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1.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

2.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

3.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

4.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.

5.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.

6.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

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

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

8.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.

9.单项选择题What will happen if a private IP address is assigned to a public interface connected to an ISP?()

A. Addresses in a private range will be not routed on the Internet backbone.
B. Only the ISP router will have the capability to access the public network.
C. The NAT process will be used to translate this address in a valid IP address.
D. Several automated methods will be necessary on the private network.
E. A conflict of IP addresses happens, because other public routers can use the same range.

10.单项选择题Which IP address can be assigned to an Internet interface?()

A. 10.180.48.224
B. 9.255.255.10
C. 192.168.20.223
D. 172.16.200.18

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