| Let's test your knowledge of important | | | | buffers will be overwhelmed with the |
| topics such as SYN attacks and VLANs for | | | | false (and unfinished) requests. |
| your Cisco CCNA, CCNP, and CCENT exams, | | | | CCNP Certification / BSCI Exam: |
| as well as the CompTIA Security+ and | | | | If an IPv6 address begins with "FF", |
| Network+ certification exams! | | | | what type of address is it? |
| CCNA / CCENT / CompTIA Network+ | | | | A. broadcast |
| Certification: | | | | B. unicast |
| Host A and Host B are in the same VLAN. | | | | C. multicast |
| Host C and Host D are in a different | | | | D. MACcast |
| VLAN. Host A sends a broadcast. How many | | | | Answer: C. That's a multicast. There's |
| other hosts will receive it? | | | | no such thing as a MACcast. But there |
| A. Zero | | | | should be. ;) |
| B. One | | | | CCNP Certification / BCMSN Exam: |
| C. Two | | | | Short answer: What interface-level |
| D. Three | | | | command takes a port operating at L3 and |
| Answer: B. The other host in the same | | | | places it into L2 operating mode? |
| VLAN, Host B, will receive it. | | | | Answer: switchport. To change the port |
| Broadcasts are not forwarded to other | | | | back to a routed port, use no |
| VLANs. | | | | switchport. |
| Security+ Certification: | | | | CCNP Certification / ISCW Exam: |
| Briefly describe a "SYN attack". | | | | Short answer: You're going to write a |
| Answer: The intruder will generate a | | | | policy map that will be applied to a |
| series of SYN requests, and the | | | | Serial interface running at T1 speed. By |
| soon-to-be-victimized network device | | | | default, how much bandwidth can you |
| sends a SYN-ACK in response. The device | | | | assign in that policy? |
| then waits for an ACK, but that never | | | | Answer: The speed of a T1 line is 1544 |
| comes. These unfinished connections | | | | kbps, but by default only 75% of that |
| result in the network device not being | | | | bandwidth can be distributed in a policy |
| able to accept SYN request from | | | | map - that's 1158 kbps (1544 * .75). |
| legitimate network hosts, since its | | | | |