Week 9 Take Test: Lab 6 (Ping and Traceroute) Questionnaire H Take Test: Lab 6 (Ping and Traceroute) Questionnaire Take Test: Lab 6 (Ping and Traceroute) Questionnaire Test Information Description Instructions Multiple Attempts This test allows 5 attempts. This is attempt number 1. Force Completion This test can be saved and resumed later. Your answers are saved automatically. Q U E S T I O N 1 Task 1 Take a look at the ping result screenshot below: F h d i li ? S l t ll th t li l ti 1 points Save Answer Save Answer ? ? Question Completion Status: My SUTD Courses Courses Services Copyright Student Corner Click Save and Submit to save and submit. Click Save All Answers to save all answers. Save All Answers Save All Answers Save and Subm Save and Subm Bondugula Varun Teja 96 From whom do you receive replies? Select all that applies, selecting a wrong answer results in 50% penalty but negative marks don't overflow. 23.185.0.3 Pantheon (CDN) A webserver whose infrastructure owned by MIT 128.30.2.109 For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). Q U E S T I O N 2 www.csail.mit.edu www.berkeley.edu www.usyd.edu.au www.kyoto-u.ac.jp Task 1 Use ping to send 10 packets (56 bytes each) to each of the following hosts, and there should be an interval of 5 seconds between each packet sent: P 0 W ORDS PO W ERED B Y T IN Y 1 points Save Answer Save Answer Q U E S T I O N 3 Task 1 When you have completed Task 1, you notice that there is varying RTT to the 4 servers. Since the packet size is constant and small (56KB), of the four components of the per-hop network delay, which one least likely accounts for the differences in the RTT? Transmission Delay Processing Delay Queueing Delay Propagation Delay 1 points Save Answer Save Answer Q U E S T I O N 4 www.csail.mit.edu www.berkeley.edu www.usyd.edu.au www kyoto u ac jp Task 2 Use ping to send 10 packets (512 bytes each, then 1024 bytes each) to each of the following hosts, and there should be an interval of 5 seconds between each packet sent: 1 points Save Answer Save Answer P a r ag r a p h O p e n S a ns , s ... 10 pt Click Save and Submit to save and submit. Click Save All Answers to save all answers. For the toolbar, press ALT+F10 (PC) or ALT+FN+F10 (Mac). www.kyoto-u.ac.jp P 0 W ORDS PO W ERED B Y T IN Y Q U E S T I O N 5 Task 3 The webserver www.wits.ac.za is down because it doesn't answer to our ping. Selecting an incorrect answer results in -0.5 penalty. Selecting Skip will grant you 0. True False Skip 1 points Save Answer Save Answer Q U E S T I O N 6 Task 3 What is the percentage of answered ping to www.wits.ac.za from Task 3? 1 points Save Answer Save Answer Q U E S T I O N 7 Task 4 After receiving _______________ message, traceroute stops sending more packets and terminates. ICMP Port Unreachable ICMP TTL Exceeded HTTP POST Request HTTPs POST Request ICMP Echo 1 points Save Answer Save Answer Q U E S T I O N 8 Task 4 Consider the traceroute output below. State whether this is true: the RTT to a later hop router is always higher than that to an earlier one. Selecting an incorrect answer incurs -0.5 penalty. Selecting "Skip" will grant you 0. 1 points Save Answer Save Answer P a r ag r a p h O p e n S a ns , s ... 10 pt Click Save and Submit to save and submit. Click Save All Answers to save all answers. 0. True False Skip Q U E S T I O N 9 Task 4 It is possible for traceroute to show 3 packets with 3 different types of ms value on every hop. Selecting an incorrect answer incurs -0.5 penalty. Selecting "Skip" will grant you 0. True False Skip 1 points Save Answer Save Answer Q U E S T I O N 1 0 Task 4 Traceroute that terminates on the port unreachable condition. Which protocol produces this "port unreachable" message? Select all that applies, selecting a wrong answer results in 50% penalty but negative marks don't overflow. IP HTTP ICMP UDP 1 points Save Answer Save Answer Click Save and Submit to save and submit. Click Save All Answers to save all answers. TCP Q U E S T I O N 1 1 Task 4 Which destination port will traceroute send the packet to? Port 22 (SSH) Port 443 (HTTPs) Port 80 (HTTP) A highly unlikely / unused port Port 23 (Telnet) 1 points Save Answer Save Answer Q U E S T I O N 1 2 Task 4 Which layer does ICMP belong to? Transport Layer Physical Layer Application Layer Link Layer Network Layer 1 points Save Answer Save Answer Q U E S T I O N 1 3 Task 4 You know that traceroute can display possible routes that an internet protocol packet might possibly take to reach its destination. The router that reduces the packet's TTL to 0 will send _____________ message back to the source (our computer). ICMP TTL Exceeded ICMP Echo Message ICMP Terminate Packet ICMP Port Unreachable 1 points Save Answer Save Answer Q U E S T I O N 1 4 Task 5 When connected to SUTD Wifi, your computer's public IP address is the same as your computer's private IP address. Google how to find out your private IP address for this question and compare the two. S l ti i t lt i 0 5 lt S l ti Ski ill t 1 points Save Answer Save Answer Click Save and Submit to save and submit. Click Save All Answers to save all answers. Selecting an incorrect answer results in -0.5 penalty. Selecting Skip will grant you 0. True False Skip Q U E S T I O N 1 5 Task 7 and Task 8 The route you get from Task 7 is always a mirror of the route you get from Task 8, e.g: if in Task 7 you get the route: remote host -- hop IP A -- hop IP B -- your computer, in Task 8 you will get the route: your computer -- hop IP B -- hop IP A -- remote host. Selecting an incorrect answer results in -0.5 penalty. Selecting Skip will grant you 0. True False Skip 1 points Save Answer Save Answer Q U E S T I O N 1 6 Network Performance (General Question) If a burst of 5 packets arrive at an output port (initially idle) at the same time, what is the average queueing delay in seconds ? Assume 10 Mb/s Ethernet, a packet size of 1 Mb, and sufficient buffer capacity for all the packets. 1 points Save Answer Save Answer Q U E S T I O N 1 7 1 points Save Answer Save Answer Click Save and Submit to save and submit. Click Save All Answers to save all answers. 1. All routers will wait for all bits to be received before sending it to the next hop. 2. All delays except transmission delay is negligible 3. No packet is lost (buffer in the routers is sufficient) Network Performance (General Question) Take a look at the simple diagram below. R1, R2, R3, and R4 are routers, with the link bandwidth as written. Suppose the we would like to send a 1Mb packet from the Source to Destination and assume that: What is the minimum delay (in seconds) that can be achieved to send a 1Mb packet from Source to Destination? Q U E S T I O N 1 8 Network Performance (General Question) Take a look at the simple diagram below. R1 and R2 are routers, with the link loss rate as written. What is the overall loss rate (in %) between Source to Destination via this path? 1 points Save Answer Save Answer Click Save and Submit to save and submit. Click Save All Answers to save all answers. Q U E S T I O N 1 9 Network Performance (General Question) The link layer technology (e.g., Ethernet vs. FDDI) determines the delay Note for revision: Ethernet and FDDI encompasses both physical layer and link layer technologies, but the above question refers to the link layer portion of it. 1 points Save Answer Save Answer Q U E S T I O N 2 0 Network Performance (General Question) Of the four components of the per-hop network delay, which ones can be highly variable in operation? Select all that applies, selecting a wrong answer results in 50% penalty but negative marks don't overflow. Queueing Transmission Propagation Processing None of the options 1 points Save Answer Save Answer Click Save and Submit to save and submit. Click Save All Answers to save all answers.