1
GATE CSE 2006
MCQ (Single Correct Answer)
+2
-0.6
Consider the diagram shown below where a number of LANs are connected by (transparent) bridges. In order to avoid packets looping through circuits in the graph, the bridges organize themselves in a spanning tree. First, the root bridge is identified as the bridge with the least serial number. Next, the root sends out (one or more) data units to enable the setting up of the spanning tree of shortest paths from the root bridge to each bridge. Each bridge identifies a port (the root port) through which it will forward frames to the root bridge. Port conflicts are always resolved in favour of the port with the lower index value. When there is a possibility of multiple bridges forwarding to the same LAN (but not through the root port), ties are broken as follows: bridges closest to the root get preference and between such bridges, the one with the lowest serial number is preferred. GATE CSE 2006 Computer Networks - Lan Technologies and Wi-Fi Question 9 English Consider the correct spanning tree for the previous question. Let host H1 send out a broadcast ping packet. Which of the following options represents the correct forwarding table on B3?
A
GATE CSE 2006 Computer Networks - Lan Technologies and Wi-Fi Question 9 English Option 1
B
GATE CSE 2006 Computer Networks - Lan Technologies and Wi-Fi Question 9 English Option 2
C
GATE CSE 2006 Computer Networks - Lan Technologies and Wi-Fi Question 9 English Option 3
D
GATE CSE 2006 Computer Networks - Lan Technologies and Wi-Fi Question 9 English Option 4
2
GATE CSE 2006
MCQ (Single Correct Answer)
+2
-0.6
Consider the diagram shown below where a number of LANs are connected by (transparent) bridges. In order to avoid packets looping through circuits in the graph, the bridges organize themselves in a spanning tree. First, the root bridge is identified as the bridge with the least serial number. Next, the root sends out (one or more) data units to enable the setting up of the spanning tree of shortest paths from the root bridge to each bridge. Each bridge identifies a port (the root port) through which it will forward frames to the root bridge. Port conflicts are always resolved in favour of the port with the lower index value. When there is a possibility of multiple bridges forwarding to the same LAN (but not through the root port), ties are broken as follows: bridges closest to the root get preference and between such bridges, the one with the lowest serial number is preferred. GATE CSE 2006 Computer Networks - Lan Technologies and Wi-Fi Question 10 English For the given connection of LANs by bridges, which one of the following choices represents the depth-first traversal of the spanning tree of bridges?
A
B1, B5, B3, B4, B2
B
B1, B3, B5, B2, B4
C
B1, B5, B2, B3, B4
D
B1, B3, B4, B5, B2
3
GATE CSE 2005
MCQ (Single Correct Answer)
+2
-0.6
Suppose the round trip propagation delay for a 10 Mbps Ethernet having 48-bit jamming signal is 46.4 μs. The minimum frame size is
A
94
B
416
C
464
D
512
4
GATE CSE 2004
MCQ (Single Correct Answer)
+2
-0.6
A and B are the only two stations on an Ethernet. Each has a steady queue of frames to send. Both A and B attempt to transmit a frame, collide, and A wins the first backoff race. At the end of this successful transmission by A, both A and B attempt to transmit and collide. The probability that A wins the second backoff race is
A
0.5
B
0.625
C
0.75
D
1.0
GATE CSE Subjects
Software Engineering
Web Technologies
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Medical
NEET
Graduate Aptitude Test in Engineering
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CBSE
Class 12