QUESTION 201 A series of Switches are connected as shown in the following exhibit:
Which portion contains both the potential networking problem and the protocol or setting that would be used to prevent this problem?
A. routing loops, hold down timers
B. switching loops, split horizon
C. routing loops, split horizon
D. switching loops, VTP
E. routing loops, STP
F. switching loops, STP Answer: F Explanation: Spanning-Tree Protocol (STP) prevents loops from being formed when switches or bridges are interconnected via multiple paths. Spanning-Tree Protocol implements the 802.1D IEEE algorithm by exchanging BPDU messages with other switches to detect loops, and then removes the loop by shutting down selected bridge interfaces. This algorithm guarantees that there is one and only one active path between two network devices. http://www.cisco.com/en/US/tech/tk389/tk621/tk5/tech_protocol_home.html
QUESTION 202 You are the network administrator at Cisco Highway. The Cisco Highway network has a single Class C IP address. VLSM is implemented on the network. Which subnet mask would be the most efficient for point-to-point serial Links on the Cisco Highway network?
A. 255.255.255.0
B. 255.255.255.240
C. 255.255.255.248
D. 255.255.255.252
E. 255.255.255.254 Answer: B Explanation: Point-to-Point serial Links needs two IP addresses to be configured on both sides of the interfaces. It means we require 2 host addresses. With 2 host bits we get 4 hosts out of which all zero's and all one's is not used so we have two usable hosts. Subnet mask in this case would be 11111111.11111111.11111111.11111100 Where last 2 are the host bits to achieve 2 valid hosts. Subnet mask will be 255.255.255.252 Network Bits = 30 means /30 Host Bits = 2 Number of Hosts = 2n - 2 = 22 - 2 = 4 - 2 = 2 valid hosts
QUESTION 203 Which of the following layers are part of the TCP/IP model? (Choose three.)
A. application layer
B. session layer
C. transport layer
D. internet layer
E. network layer
F. data link layer
G. physical layer Answer: A, C, D Explanation: TCP/IP's architecture does not use the presentation and session layers. The application layer protocols use the transport layer services directly. The OSI transport layer provides connection-oriented service; in TCP/IP, this service is provided by TCP. TCP/IP also provides connectionless service in the transport layer with UDP. The Internet layer of TCP/IP corresponds to the network layer of the OSI model. Although OSI network-layer protocols provide connection-oriented (Connection-Model Network Service (CMNS), X.25) or Connectionless Network Service (CLNS), IP provides only connectionless network service. The routing protocols are network layer protocols with an IP protocol number. Reference: CCNA ICND Exam Certification Guide by Wendell OdemPg.268
QUESTION 204 You are the network administrator at Cisco Highway. The RIP routing protocol is being used on the Cisco Highway network. RIP is configured with default settings and equal cost load balancing. The Cisco Highway network has six paths with the same metric and administrative distance for a single destination. Which of the six paths will RIP use to reach the destination?
A. Only the first two paths that are learned.
B. Four of the paths.
C. All six routes in a routed robin fashion.
D. The oldest two paths in the routing table.
E. The first path learned to the destination network. Answer: E Explanation: To set the maximum number of routes that RIP can insert into the routing table., use the rip equal- cost command Enter a number from 1 to 15. The default is 1. For example: (config)# rip equal-cost 4 To reset the number of routes to the default value of 1, enter: (config)# no rip equal-cost
