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Home > Archive > CCNA > September 2001 > Need help answering questions found on web
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Need help answering questions found on web
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| hemistoya 2001-09-07, 8:07 am |
| My cisco classmates and I have been pooling questions and answers we've found on the web and building our own study guide prior to taking the exam. We've researched every question, but there are still a few we disagree on. Could anyone help us?
1. You are configuring a frame relay router with subinterfaces on interface serial 0. Which subinterface numbers could you use?
A. 1 and 2
B. 0.1 and 0.2
C. 1 and 2.2
D. 0.1a and 0.2a
Answer: Some of us like A; others like myself prefer B.
2. Which statement about half-duplex Ethernet operation is true?
A. Transmitted frames feed into a single cable in one direction at a time.
B. Half-duplex is achieved by using point-to-point Ethernet and Fast Ethernet connections.
C. Half-duplex is achieved by using point-to-multipoint Ethernet and Fast Ethernet connections.
D. Half-duplex is achieved by connecting the transmitting circuit of one node to the receiving circuit of another node in a point-to-point connection.
Answer: It's either A or C, since the other two answers refer to full-duplex. However, again we are divided on this issue. I think the answer is C, since a digital signal travels through a baseband cable in BOTH directions at the same time, and half-duplex occurs whenever multipoint Ethernet segments are in use.
3. What is NOT a characteristic of a network segment connected to a switch port?
A. The segment has its own collision domain.
B. The segment can translate between different media types.
C. All devices in the segment are part of the same broadcast domain.
D. Only one device per segment can concurrently send frames to the switch.
Answer: We are divided between B and D. I prefer B because media translation is normally only a function of a translation bridge, not a switch. Also, multiple devices (each on a different switch port) can be transmitting through the switch simultaneously if their frames are bound for different destinations, which is why they each have 10 Mbps bandwidth.
4. Which statement is true when a broadcast is sent in an Ethernet LAN?
A. The IP subnet used is 255.255.255.0.
B. The IP Address used is 255.255.255.255.
C. The MAC address used is 00-00-00-00-00-00.
D. The MAC address used is FF-FF-FF-FF-FF-FF.
Answer: We are divided between B and D. Some of us prefer D, because it is always true of an Ethernet broadcast, while if the broadcast is a subnet broadcast, the IP address could be something like 172.16.8.255.
5. When you use the cisco ISO command "Show config" on a router, which part of the output shows specific configured IP addresses and subnet masks?
A. The IP host table.
B. The interface output.
C. Each section of the output.
D. The global configuration statements
E. The section under the autonomous system number.
Answer: We've narrowed it down to A or B. I think it is B, since the "show config" output is the same as that displayed by the "show startup-config" command. Also, you might not always have a host table.
6. Which statement from the "show spantree 1" command output indicates that VLAN 1 is functioning properly?
A. Root node is fast ethernet 0/26.
B. Port ethernet 0/1 of VLAN 1 is forwarding.
C. Designated port is ethernet 0/1, path cost is 10.
D. Designated root has prioirty 0, address 0000.588f.b600
E. VLAN 1 is executing the IEEE-compatible spanning tree protocol.
Answer: we're totalling in the dark on this one.
7. To help reduce router CPU utilization, how should a cisco router be configured for logging?
Answer: someone found just this question on the web. We're not sure which logging method produces minimal CPU utilization.
Thanks in advance for any insights you can provide.
Hemi. | |
| dmaftei 2001-09-07, 9:10 am |
| 1. You are configuring a frame relay router with subinterfaces on interface serial 0. Which subinterface numbers could you use?
A. 1 and 2
B. 0.1 and 0.2
C. 1 and 2.2
D. 0.1a and 0.2a
B. The dots denote subinterfaces.
2. Which statement about half-duplex Ethernet operation is true?
A. Transmitted frames feed into a single cable in one direction at a time.
B. Half-duplex is achieved by using point-to-point Ethernet and Fast Ethernet connections.
C. Half-duplex is achieved by using point-to-multipoint Ethernet and Fast Ethernet connections.
D. Half-duplex is achieved by connecting the transmitting circuit of one node to the receiving circuit of another node in a point-to-point connection.
A. By definition half-duplex transmits in one direction at a time.
3. What is NOT a characteristic of a network segment connected to a switch port?
A. The segment has its own collision domain.
B. The segment can translate between different media types.
C. All devices in the segment are part of the same broadcast domain.
D. Only one device per segment can concurrently send frames to the switch.
I'll need to think more about this one.
4. Which statement is true when a broadcast is sent in an Ethernet LAN?
A. The IP subnet used is 255.255.255.0.
B. The IP Address used is 255.255.255.255.
C. The MAC address used is 00-00-00-00-00-00.
D. The MAC address used is FF-FF-FF-FF-FF-FF.
Should be D, by your argument.
5. When you use the cisco ISO command "Show config" on a router, which part of the output shows specific configured IP addresses and subnet masks?
A. The IP host table.
B. The interface output.
C. Each section of the output.
D. The global configuration statements
E. The section under the autonomous system number.
B. With ip host one doesn't configure IP addresses; one configures host name to IP address(es) mappings.
6. Which statement from the "show spantree 1" command output indicates that VLAN 1 is functioning properly?
A. Root node is fast ethernet 0/26.
B. Port ethernet 0/1 of VLAN 1 is forwarding.
C. Designated port is ethernet 0/1, path cost is 10.
D. Designated root has prioirty 0, address 0000.588f.b600
E. VLAN 1 is executing the IEEE-compatible spanning tree protocol.
E. I remember at least two discussions about this question on the board. The opinions were divided between B and E; I always said E. You may want to search for those threads.
7. To help reduce router CPU utilization, how should a cisco router be configured for logging?
This is not a definitive answer; I would guess logging to a syslog server. | |
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| I'd have another think about Q1, there was a big debate on this one about a year ago - you'll have to do a search for it.
Basically it was agreed that a subinterface would appear as follows x.y (i.e. 0.1 or 1.1). The x is the interface number and y is the subinterface number, I would therefore go for A.
If I remember correctly everybody eventually agreed with this as several people got 100% in the relevant section of the exam. Although I have slept since I read it!!!
I'll look at the others when I next get a chance.
Mat P. | |
| doctorcisco 2001-09-07, 3:32 pm |
| quote:
Originally posted by hemistoya
3. What is NOT a characteristic of a network segment connected to a switch port?
A. The segment has its own collision domain.
B. The segment can translate between different media types.
C. All devices in the segment are part of the same broadcast domain.
D. Only one device per segment can concurrently send frames to the switch.
Answer: We are divided between B and D. I prefer B because media translation is normally only a function of a translation bridge, not a switch.
Also, multiple devices (each on a different switch port) can be transmitting through the switch simultaneously if their frames are bound for different destinations, which is why they each have 10 Mbps bandwidth.
Your last paragraph is true, but that's not what the question is talking about. It says we have 1 switch port, and a segment (presumably multiple hosts) coming into it. If that segment is coming into one switch port, only one host can transmit to that switch port at the same time. If 2 try, you have a collision on the segment.
B is the answer the author was looking for.
Regarding your second-last paragraph, a switch is a bridge with more than 2 ports. So saying, "only a function of a translational bridge, not a switch" is something like saying, "Only a function of a sports car, not a Mazaratti." A switch with some 100BaseT UTP ports and 1 or 2 1-gigabit fiber uplink ports is doing "media translation."
An ethernet frame is the same regardless of the layer 1 medium used to transmit it. So there really isn't any "translation" happening, just a change in the layer 1 signalling. "Translational bridging" is a term usually reserved for bridging between ethernet, token ring, and/or FDDI. In other words, "translation" is usually understood to involve de-encapsulating the layer 2 frame and re-encapsulating the data in a different kind of frame.
The reason B is false is not because there's a difference between a switch and a translational bridge. It's false because if you have a bridge out there to go across a change of media, it's not really a single network segment anymore. It's multiple segments connected to a switch in a multilayered environment.
The question is badly put together because B is only false if you call a 100BaseTx<>100BaseFx transceiver a "bridge," which is debatable.
quote:
4. Which statement is true when a broadcast is sent in an Ethernet LAN?
A. The IP subnet used is 255.255.255.0.
B. The IP Address used is 255.255.255.255.
C. The MAC address used is 00-00-00-00-00-00.
D. The MAC address used is FF-FF-FF-FF-FF-FF.
Answer: We are divided between B and D. Some of us prefer D, because it is always true of an Ethernet broadcast, while if the broadcast is a subnet broadcast, the IP address could be something like 172.16.8.255.
B has a more fundamental problem than the one you describe: Ethernet broadcasts don't use IP addresses at all. They use MAC addresses. IP isn't the only layer 3 protocol that might be in an ethernet broadcast. 
quote:
7. To help reduce router CPU utilization, how should a cisco router be configured for logging?
Probably looking for "term mon."
HTH,
doctorcisco | |
| Retired-Mod 2001-09-08, 5:10 am |
| quote:
Originally posted by doctorcisco
Probably looking for "term mon."
HTH,
doctorcisco
How about "no logging console" instead
Retired | |
| hemistoya 2001-09-08, 6:02 pm |
| Thanks to all who participated. It was great to learn from you. |
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