2013 Latest Cisco 350-001 Exam Section 3: Standards (4 Questions)

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2013 Latest Cisco 350-001 Exam Section 3: Standards (4 Questions)

QUESTION NO: 1 You need to make a new cable that is to be used for connecting a switch directly to another switch using Ethernet ports. What pinouts should be used for this cable?
A. 1->3, 2->6, 3->1, 6->2
B. 1->1, 2->2, 3->3, 6->6,
C. 1->4, 2->5, 4->1, 5->2
D. 1->5, 2->4, 4->2, 5->1
E. 1->6, 2->3, 3->2, 6->1
Answer: A
Explanation:
Straight through cables are used when connecting PC hosts and router Ethernet ports to switches. Crossover cables are needed for switch to switch, and router to router connections. More information on crossover cables and their pinouts follows:
First Side of cable goesto Second Side of cable
Color Name Pin Pin Name Color
White/ Orange TX+ 1 3 RX+ White/ Orange
Orange TX- 2 6 RX- Orange
White/Gree n RX+ 3 1 TX+ White/Green
Green RX- 6 2 TX- Green
Blue Extra Pins 4 4 Optional Pins (can be connected straight to same color pins). But not used in transmissi. on Blue
White/Blue 5 5 White/Blue
White/Brown 7 7 White/Brown
Brown 8 8 Brown
eference: http://www.infonewsindia.com/pinout/pinoutnetwork.html

QUESTION NO: 2
The ITU-T Q.920 and ITU-T Q.921 drafts formally specify which protocol?

A. HDLC
B. PPP
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– 29 -C. LAPD
D. HSRP
E. LLC
Answer: C
Explanation:
The LAPD protocol is formally specified in ITU-T Q.920 and ITU-T Q.921.
Incorrect Answers:
A, D. HDLC and HSRP are both Cisco proprietary and are not formally specified in any ITU-T drafts.

QUESTION NO: 3
What is the maximum transmit value for LLC flow control, as defined formally in the IEEE 802.2 LLC standard?
A. 15
B. 127
C. 256
D. 1023
E. 4096
Answer: B
Explanation:
According to the IEEE 802.2 Logical Link Control specification, the maximum transmit value for LLC flow control is 127. The LLC flow control techniques for bridged LANs is described as follows:
Overview:
This annex describes a technique, called dynamic window flow control, to control the offering of frames to the network by an LLC entity when congestion is detected or suspected. It is most effective in a bridged LAN. The technique is one of recovery from congestion and does not prevent congestion in a bridged LAN.It is not a substitute for proper network sizing. The method employs the transmit window already permitted by the standard to regulate the flow between two LLCs using the connection-mode service. Congestion in one direction of a logical link connection is treated independently of congestion in the other direction. The technique does not involve communication with the bridges, but rather relies on a simple algorithm implemented by the LLCs. MAC protocols are unaffected.All actions described in this annex apply to the station transmitting in the direction of the congestion. The receiver does not participate, except through normal LLC procedures, and does not require knowledge of the transmitter’s participation. The service interface between the data link layer and the network layer is also unchanged.
Definitions
k: The transmit window size in use at any given time.
kmax: The maximum transmit window size, which is the maximum value that the
transmit window k may have. The value of kmax shall not exceed 127.

QUESTION NO: 4
Which is the proper signal for pin 6 of a PHY without an internal crossover MDI Signal according to the IEEE 802.3 CSMA/CD specification?
A. Receive +
B. Transmit +
C. Receive –
D. Transmit –
E. Contact 6 is not used.
Answer: C
Explanation:
The four pins that are used are 1, 2, 3, and 6 as shown below:
1 Rx+
2 Rx-3 Tx+
6 Tx-

The table below shows the pin and corresponding signal for the RJ-45 connector pinouts.

RJ-45 Connector Pinout
Pin Signal
1 TX+
2 TX-
3 RX+
6 RX-

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