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Basic Questions

November 30th, 2017 Go to comments

Question 1


Star topology is the most popular topology for the network which allows all traffic to flow through a central device.


Question 2


Carrier sense multiple access with collision detection (CSMA/CD) is a media access control method used most notably in early Ethernet (IEEE 802.3) technology for local area networking. When collision detection (CD) observes a collision (excess current above what it is generating, i.e. > 24 mA for coaxial Ethernet), it stops transmission immediately and instead transmits a 32-bit jam sequence.

Note: CSMA/CA (Carrier Sense Multiple Access/Collision Avoidance) is a protocol for carrier transmission used in wireless networks. Unlike CSMA/CD (Carrier Sense Multiple Access/Collision Detect) which deals with transmissions after a collision has occurred, CSMA/CA acts to prevent collisions before they happen.

Question 3


Each port of a router is a broadcast domain. This router has 2 ports so it has 2 broadcast domains.

Question 4

Question 5


Ethernet frame size refers to the whole Ethernet frame, including the header and the trailer while MTU size refers only to Ethernet payload. Baby giant frames refer to Ethernet frame size up to 1600 bytes, and jumbo frame refers to Ethernet frame size up to 9216 bytes (according to this link: http://www.cisco.com/c/en/us/support/docs/switches/catalyst-4000-series-switches/29805-175.html)

For example, standard Ethernet frame MTU is 1500 bytes. This does not include the Ethernet header and Cyclic Redundancy Check (CRC) trailer, which is 18 bytes in length, to make the total Ethernet frame size of 1518.

So according to strict definition, MTU size of 1600 cannot be classified as baby giant frames as the whole Ethernet frames will surely larger than 1600 -> Answer C is not correct.

Answer D is a better choice as the MTU is 1518, so the whole Ethernet frame would be 1536 (1518 + 18 Ethernet header and CRC trailer). This satisfies the requirement of baby giant frames “Baby giant frames refer to Ethernet frame size up to 1600 bytes”.

Question 6


To understand more about TCP please read our TCP and UDP tutorial.

Note: Answer F is not correct because TCP does not require applications to determine the retranmission. TCP itself will determine if the data packets should be retransmitted or not.

Question 7


Only router can break up broadcast domains so in the exhibit there are 2 broadcast domains: from e0 interface to the left is a broadcast domain and from e1 interface to the right is another broadcast domain -> A is correct.

Both router and switch can break up collision domains so there is only 1 collision domain on the left of the router (because hub doesn’t break up collision domain) and there are 6 collision domains on the right of the router (1 collision domain from e1 interface to the switch + 5 collision domains for 5 PCs in Production) -> F is correct.

Question 8


Modern Ethernet networks built with switches and full-duplex connections no longer utilize CSMA/CD. CSMA/CD is only used in obsolete shared media Ethernet (which uses repeater or hub).

Question 9


Each port of a switch is a separate collision domain. This switch uses two ports (for 5 hosts) so there are two collision domains in total.

Question 10


At the end of each frame there is a Frame Check Sequence (FCS) field. FCS can be analyzed to determine if errors have occurred. FCS uses cyclic redundancy check (CRC) algorithm to detect errors in the transmitted frames. Before sending data, the sending host generates a CRC based on the header and data of that frame. When this frame arrives, the receiving host uses the same algorithm to generate its own CRC and compare them. If they do not match then a CRC error will occur.


Preamble is used to indicate the start of the frame by arranging the first 62 bits as alternating “1/0s” and the last two bits as “1”s. Like so, 010101010101010………………………10101011. Therefore when the receiving end sees the “11” it knows where the actual Ethernet header starts. The alternating 1s and 0s will also allow the two endpoints to sync their internal clocks. In summary, preamble is used for synchronization.

The “Type/Length” field is used to indicate the “Type”of the payload (Layer 3 protocol) which is indicated as a Hexadecimal value.

Note: Ethernet II uses “Type” while the old Ethernet version use “Length”


Comments (18) Comments
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  1. Sneha
    May 10th, 2018

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    May 10th, 2018

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  3. cthelite
    May 11th, 2018

    Passed yday 90%, would have gotten higher but not enough time… Qs were about 70% of test… labs/sims were the other 30%… those killed my time, screen size was way low res, like 640×480, with huge fonts, not sure if all exams/facilities are like that but made labs difficult for me, difficult to organize windows to do labs… 90% of the Qs were similar to 9tut… labs/sims similar to here… find more labs to practice on PT, there are free ones out there… strategy for labs is go with 1st answer u think, no time to look at each possible answer… need to be EFFICIENT!.. seriously practice labs under time constraints, makes a HUGE difference… there’s no time to be nervous on the exam… Use this site to research every question… don’t get bogged down with specific “answers” from dumps, the actual exam is not tricky… spend the time researching, THAT pays off on the exam… don’t memorize answers, I only memorized a few lists… OSI/Enet frame/HSRP states/STP states/SYSLOG codes/IPv6 header/some Cloud Computing stuff… the rest you need to understand hows/whys… a few Q’s I’ve never seen remotely similar, but think I reasoned them out with overall knowledge… Good Luck!

  4. Nese
    May 12th, 2018


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