Q1

Consider a simple network topology in which there are four routers (A, B, C, D). The first 3 are connected to each other in a ring (A-B-C-A), while the fourth is connected to C through a point-to-point link (C-D). If the hosts use a flooding algorithm and router A sends a packet to D, how many copies of the same packet will be delivered to router D?

• A) 1
• B) And proportional to the value of the Time To Live field in the package.
• C) 2
• D) 3
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Q2

Any Frame crossing a transparent switch:

• A) Is explicitly addressed to the MAC address of the switch.
• B) Does not change its address when it crosses the switch.
• C) Changes its source address when it leaves the switch.
• D) Changes its source address if it belongs to a VLAN.
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Q3

The use of the MAC destination address of a frame for backward learning consists in:

• A) Nothing; it is not used.
• B) Associating an output port of the switch based on the 3 most significant bytes of the address.