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


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1.多項選擇題Which of the following describes the roles of devices in a WAN? （）

A.A CSU/DSU terminates a digital local loop
B.A modem terminates a digital local loop
C.A CSU/DSU terminates an analog local loop
D.A modem terminates an analog local loop
E.A router is commonly considered a DTE device
F.A router is commonly considered a DCE device

2.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

3.多項選擇題Which of the following are key characteristics of PPP? （）

A.can be used over analog circuits
B.maps Layer 2 to Layer 3 address
C.encapsulates several routed protocols
D.supports IP only
E.provides error correction

4.多項選擇題Which three approaches can be used while migrating from an IPV4 addressing scheme to an IPV6 scheme？（）

A.statically map IPV4 address to IPV6 addresses
B.configuration IPv4 tunnels between IPV6 islands
C.use DHCPv6 to map IPV4 addresses to IPV6 addresses
D.use proxying and translation to translate IPV6 packets into IPV4 packets
E.configure IPV6 directly
F.enable dual-stack routing

5.單項選擇題A default Frame Relay WAN is classified as what type of physical network?（）

A.point-to-point
B.broadcast multi-access
C.nonbroadcast multi-access
D.nonbroadcast multipoint
E.broadcast point-to-multipoint

6.單項選擇題The following configuration line was added to router R1 Access-list 101 permit ip 10.25.30.0 0.0.0.255 any What is the effect of this access list configuration?（）

A.ermit all packets matching the first three octets of the source address to all destinations
B.permit all packet matching the last octet of the destination address and accept all source addresses
C.permit all packet matching the host bits in the source address to all destinations
D.permit all packet from the third subnet of the network address to all destinations

7.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.

9.單項選擇題How will the above access lists affect traffic?（）

A.FTP traffic from 192.169.1.22 will be denied
B.No traffic, except for FTP traffic will be allowed to exit E0
C.FTP traffic from 192.169.1.9 to any host will be denied
D.All traffic exiting E0 will be denied
E.All FTP traffic to network 192.169.1.9/29 will be denied

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