思科认证考试（ＣＣＮＡ）考试模拟题２０—３９及答案(3)
添加时间: 2007-9-3 22:10:17 作者: Cisco认证考试 阅读次数:50 来源: http://www.d9soft.com
a) Allows the use of a more robust addressing scheme.
b) Allows for a larger scalable network
c) Reduces convergence time
d) Allows "supernetting"
e) All of the above.
Answer
e) All of the above
24. [OxNx] Which of the following are reasons for the OSI model?
a) Standardizes interfaces
b) Allows modular engineering
c) Facilitates learning and teaching
d) All of the above.
Answer
d) All of the above
25. [RxNx] Which of the following is NOT a ROUTING protocol:
a) OSPF
b) RIP
c) IPX
d) EIGRP
e) NLSP.
Answer
c) IPX
There are routing protocols and routed protocols. Some examples of routed protocols include IP, IPX, Appletalk and Decnet. A routed protocol travels through the network. Routing protocols such as OSPF, IP RIP, IPX RIP, IGRP and EIGRP represent the language that routers use to determine the best path through the network.
26. [RxNx] Which statement is NOT true about link state protocols:
a) Link state advertisements are sent to all routers in an area.
b) Each router executes the SPF algorithm.
c) Link state routers keep a topological database of the network.
d) Link state routers include the originating router s routing table.
e) Link state routers know of possible alternate paths to a particular network.
Answer
d) Link state routers include the originating router s routing table.
Choice d is not true because during the flooding stage neighbor routers communicate their directly connected networks. They DO NOT communicate routing tables, as a Distance Vector routing protocol would.
27. [RxNx] Which of the following would NOT appear in a routing table?
a) Next hop address
b) Interface Port references
c) MAC address
d) Network address
e) Metrics
Answer
c) MAC address
A router is a device that operates at layer 3 where logical addresses are used, not physical addresses. A switch or a bridge would contain MAC addresses in the bridge table.
28. [OxNx] Which statement is true of the Datalink OSI layer ?
a) 802.3 is the MAC sub layer.
b) No such thing
c) MAC sublayer provides the connection to the network layer.
d) MAC sublayer uses SAPS to access the network layer.
e) SAP sublayer uses the MAC layer to access the LAN medium.
Answer
a) 802.3 is the MAC sub layer.
The IEEE subdivided the data link layer into two sublayers. 1) MAC Media Access Control, which provides access to the LAN media 2) LLC Logical Link Control, which provides protocols media independent access.
29. [RINx] Given the IP address of 193.243.12.43 and a subnet mask of 255.255.255.128, what is the subnet address?
a) 194.243.12.32
b) 193.243.0.0
c) 194.243.12.43
d) 193.243.12.128
e) None of the above.
Answer
e) none of the above
The address of 193.243.12.43/25 would be on the zero subnet and would be represented as 193.243.12.0
I have used the slash format to represent the mask. This means that the first 25 bits represent the address of the wire.
30. [CxNx] Cisco uses a naming convention to identify frame types. Which four of the following mappings are correct?
Cisco_name = Common_name
a) cisco_II = Ethernet_II
b) arpa = Ethernet_II
c) sap = Ethernet_802.3
d) sap = Ethernet_802.2 LLC
e) Novell Ether = Ethernet_802.2 LLC
f) cisco_802 = Ethernet_802.2 LLC
g) snap = Token Ring Snap
h) snap = Ethernet_SNAP
Answer
b) arpa = Ethernet_II
d) sap = Ethernet_802.2 LLC
g) snap = Token Ring Snap
h) snap = Ethernet_SNAP
Frame type naming has been an area of confusion since Novell chose to use a frame type of 802.3 which differs from the IEEE 802.3 frame type format. This was compounded when Novell changed their default frame type from 802.3 to 802.2. Cisco has further confused this area by choosing another proprietary naming scheme. Here is a chart that matches some common frame type names to the frame type names used by Cisco and Novell.
上下文章:
上一篇文章: 思科认证考试（ＣＣＮＡ）考试模拟题２０—３９及答案(2) 下一篇文章: 思科认证考试（ＣＣＮＡ）考试模拟题２０—３９及答案(4)
相关文章: