JUNOS Enterprise Switching

Chapter Review Questions

1. Which is true regarding 802.3?

   1. Uses a Length field and LLC

   2. Uses a Type field and LLC

   3. Does not use LLC

   4. Defines a Token Ring LAN

2. What is the first layer with end-to-end flow?

   1. Layer 1

   2. Layer 2

   3. Layer 3

   4. Layer 4

3. True or False: a bridge extends a LAN’s collision domain.

4. What is the role of ARP?

   1. Permits Layer 2 and Layer 3 address independence

   2. Is used in Ethernet only

   3. ARP is not required in a bridged network

   4. All of the above

5. How many networks and how many hosts can you address with a 200.0.0.0/30 address?

   1. 1/2

   2. 2/2

   3. 10/10

   4. 200/200

6. What class is the IP address 128.69.0.0/24?

   1. Class B with a Class B mask

   2. Class B with a Class C mask

   3. Class A with a default mask

   4. Class C with a default mask

7. What type of media is common in a star-wired bus?

   1. Thick coax

   2. Thin coax

   3. UTP

   4. Fiber

   5. Both C and D

8. In the indirect delivery model, the source station sends an ARP for which of the following?

   1. The target host

   2. The next hop, which is a default gateway

   3. The next hop, which is a bridge

   4. None of the above; ARP is not needed for indirect communications

9. What protocol provides a reliable transfer service?

   1. IP

   2. ICMP

   3. UDP

   4. TCP

10. What type of error message does a bridge send when it needs to fragment but is unable to do so?

    1. An ICMP fragment needed error

    2. An ICMP destination unreachable error

    3. An IGMP fragment needed error

    4. None of the above; it does silent discard and cannot generate any errors

11. Which author wrote this chapter?

    1. Opinionated “Hot-Head Harry”

    2. Just-the-facts “Diplomatic Doug”