多項選擇題For what two purposes does the Ethernet protocol use physical addresses?（）

A. to uniquely identify devices at Layer 2
B. to allow communication with devices on a different network
C. to differentiate a Layer 2 frame from a Layer 3 packet
D. to establish a priority system to determine which device gets to transmit first
E. to allow communication between different devices on the same network
F. to allow detection of a remote device when its physical address is unknown


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1.多項選擇題What are three characteristics of the OSPF routing protocol?（）

A. It converges quickly.
B. OSPF is a classful routing protocol.
C. It uses cost to determine the best route.
D. It uses the DUAL algorithm to determine the best route.
E. OSPF routers send the complete routing table to all directly attached routers.
F. OSPF routers discover neighbors before exchanging routing information.

2.多項選擇題Which three IP addresses can be assigned to hosts if the subnet mask is /27 and subnet zero is usable?（）

A.10.15.32.17
B.17.15.66.128
C.66.55.128.1
D.135.1.64.34
E.129.33.192.192
F.192.168.5.63

3.多項選擇題Which two subnetworks would be included in the summarized address of 172.31.80.0 /20?（）

A.172.31.17.4/30
B.172.31.51.16/30
C.172.31.64.0/18
D.172.31.80.0/22
E.172.31.92.0/22
F.172.31.192.0/18

4.多項選擇題What can be determined from the line of show ip route output shown in the exhibit?（）

A. The next routing update can be expected in 35 seconds.
B. The IP address 10.10.10.6 is configured on S0/1.
C. The IP address 10.10.10.8 is configured on S0/1.
D. This route is using the default administrative distance.
E. The 10.10.10.8 network is two hops away from this router.

5.多項選擇題Which destination addresses will be used by Host A to send data to Host C?（）

A. the IP address of Switch 1 
B. the MAC address of Switch 1
C. the IP address of Host C
D. the MAC address of Host C
E. the IP address of the router's E0 interface
F. the MAC address of the router's E0 interface

6.多項選擇題Which of the following are types of flow control?（）

A.buffering
B.cut-through
C.windowing
D.congestion avoidance
E.load balancing

7.多項選擇題Which of the following IP addresses fall into the CIDR block of 115.64.4.0/22?（）

A.115.64.8.32
B.115.64.7.64
C.115.64.6.255
D.115.64.3.255
E.115.64.5.128
F.115.64.12.128

8.多項選擇題

An administrator is unsuccessful in adding VLAN 50 to aswitch. While troubleshooting the problem, the administrator views the output of the show vtp status command, which is displayed in the graphic. What commands must be issued on this switch to add VLAN 50 to the database?（）

A. Switch(config-if)# switchport access vlan 50
B. Switch(vlan)# vtp server
C. Switch(config)# config-revision 20
D. Switch(config)# vlan 50 name Tech
E. Switch(vlan)# vlan 50
F. Switch(vlan)# switchport trunk vlan 50

9.多項選擇題Which statements describe the routing protocol OSPF?（）

A. It supports VLSM.
B. It is used to route between autonomous systems.
C. It confines network instability to one area of the network.
D. It increases routing overhead on the network.
E. It allows extensive control of routing updates.
F. It is simpler to configure than RIP v2.

10.多項選擇題What information does a router running a link-state protocol use to build and maintain its topological database?（）

A. hello packets
B. SAP messages sent by other routers
C. LSAs from other routers
D. beacons received on point-to-point links
E. routing tables received from other link-state routers
F. TTL packets from designated routers