Question

Q1 Error detection/correction Can these schemes correct bit errors: Internet checksums, two-dimendional parity, cyclic redundancy check (CRC) A. Yes, No, No B. No, Yes, Yes c. No, Yes, No D. No, No, Yes E. Ho, hum, ha Q2 CRC vs Internet checksums Which of these is not true? A. CRC's are commonly used at the link layer B. CRC's can detect any bit error of up to r bits with an r-bit EDC. c. CRC's are more resilient to bursty bit errors D. CRC's can not correct bit errors Q3 Random access Consider an ALOHA network with N users that transmit with probability p in slots just after a collision. Assuming users have infinite data to send, what is the probability that a slot is successful (no collisions? A. Np p(1-p)N1 c. Np(1-p)N-1 D.C(N, N/2) p (1-p)N-1 E. Np/(1-p) B. Q1: Connection/-less service Which of the following is connection- oriented? Pick one. A. TCP, datagram network B. UDP, virtual circuit network C. TCP, virtual circuit network D. UDP, datagram network E. TCP, virtual circuit network, datagram network Q2: Connection state Which of the following relies on connection state in routers in the network? Pick one. A. TCP B. Internet C. Virtual circuit network D.UDP E. A and C Q4: Virtual circuit Which of the following is true? Pick one. A.A virtual circuit uses a different VC number for each link along a route B.A virtual circuit uses the same VC number for all packets in a connection C.A virtual circuit router usses the destination address (among other fields) in order to determine the outgoing interface D .A and C Q5: Longest prefix matching On which outgoing interface will a packet destined to 11011001 be forwarded? Prefix Interface 1* A 11* 111* C Default Q6: Router architecture Where will queuing delay or loss occur if the link bandwidth (but not the switching fabric) is the bottleneck? A. Input port B. Output port Q7: Router architecture Where does head-of-the-line blocking occur? A. Input port B. Output port Q8: Router architecture The amount of buffering memory required in a router increases/decreases with the number of simultaneous TCP flows flowing through it. A. increases B. decreases Q1 Header fields Which of the following fields not part of either a TCP or UDP header? A. Source port B. Source IP address c. Receive window D. Length E. Checksum Q2 IP prefixes How many IP addresses belong to the subnet 128.119.254.0/25 ? Q3 How many subnets How many subnets are there in this network? 223.1.8.1 223.1.8.0 223.1.2.6 223.1.3.27 223.1.2.1 1223.1.3.2 |223.1.2.2 223.1.3.1 Q1IP addressing: subnets The two subnets 128.119.245.129/25 and 128.119.245.4/26 have overlapping IP addresses. A. True B.False Q2 IP addressing: DHCP What transport protocol does DHCP use? A. UDP в. ТСР c. IP D.HTTP Q3 IP addressing: NATS A host with a private IP address 192.168.0.2 opens a TCP socket on its local port 4567 and connects to a web server at 34.5.6.7. The NAT's public IP address is 22.33.44.55. Which of the following mapping entries coutebthe NAT2. 192.168.0.2 create as a result? A. [22.33.44.55, 3333][192.168.0.2 NA Taut [34.5.6.7, 80][22.33.44.55, 4567] c. [192.168.0.2, 801 134.5.6.7, 4567] D. [22.33.44.55, 3967][192.168.0.2, 451 B . 34.5.6.7 Q4 IP addressing: NATS A host with a private IP address 192.168.0.2 opens a TCP socket on its local port 4567 and connects to a web server at 34.5.6.7. The NAT's public IP address is 22.33.44.55 Suppose the NAT created the mapping [22.33.44.55, 3967] [192.168.0.2, 4567] as a result. What are the source and destination 192.168.0.2 port numbers in the SYNACK response the server? NAT router A. 80, 3967 4567, 80 c. 3967, 80 3967, 4567 B. D . 34.5.6.7 Q5 IP addressing: NATS Which of the following is false about NATS? A. NATS are network layer devices but process both network and transport layer headers. B. The number of possible simultaneous connections through a NAT is limited by the size of the port number space. c. The number of possible simultaneous connections through a NAT is limited by the size of the private (LAN-side) IP address space D. Outgoing packets from a NAT originating from different LAN-side machines can not have the same [srclP, srcPort] Q6 IP addressing IPV6 Which of the following is not true? A. IPV6 increases the size of the IP address space from 2^32 to 2^128 B. IPV6 removes checksums and fragmentation compared to IPV4 c. IPV6 has fixed length headers. D. IPV6 adds reliability at the network layer. Q1lntradomain routing Which of link state and distance vector routing has more predictable convergence times? 1. Link state 2. Distance vector Q2 Intradomain routing In this link-state routing network running Dijkstra's algorithm, the set N' (the set of nodes to which the least cost is definitively known) is initially (u After two iterations, which nodes belong to N'? A. U 3 5 B. UX Su 5 4 1 C.UW 1 D.UVX 3 E. UWX Ln/ LC Q4 Intradomain routing In this distance vector routing network, roughly how many iterations will the network take to re-converge after the event shown? 2 80 Q1Network-layer functions Which of the following are respectively used to (1) assign an IP address, (2) forward packets, (3) compute routes within an AS? A. DHCP, longest prefix matching, link-state routing B.IP, NAT, BGP c. IP, memory/bus/interconnection architecture, OSPF D. DNS, longest-prefix matching, interdomain routing Е. ТСР, IP, BGP Q2 Internet routing What is hot-potato routing used for? To determine whether to accept or decline a route B. To determine whether and who to re- advertise a route A . c. To determine the best interdomain route by relying on intradomain routing information D. To determine the best interdomain route based on local preferences. E. To disseminate interdomain routing information to routers within an AS Q3 Internet routing What is the most number of iterations that RIP can take to re-converge after a routing event? (Hint: how bad can count-to-infinity be in RIP given its implementation?) Q4 Internet routing Are the two routes below allowed by valley-free routing? The source is the leftmost node and the destination is the rightmost. Arrows indicate customer-to- provider $-flow relationship, non- arrowed lines indicate peerirO A. Yes, Yes В. No, No c. Yes, No D. No, Yes

Answer 1

Q1: Connection/-less service Which of the following is connection- oriented? Pick one. TCP, datagram network B.UDP, virtual circuit network C. TCP, virtual circuit network UDP, datagram network E. TCP, virtual circuit network, datagram network

Q2 IP addressing: DHCP What transport protocol does DHCP use? UDP TCP cIP HTTP

Q7: Router architecture Where does head-of-the-line blocking occur? A. Input port B. Output part

How many IP addresses belong to the subnet 128.119.254.0/25? 10000000 01110111 11111110 00000000 Red color -Subnet part Black color-host part So 2 7 Total 128 addresses In that 126 usable IP addresses are there

Q1 Header fields Which of the following fields not part of either a TCP or UDP header? Source port Source IP address c. Receive window D. Length Checksum

--

Explanation

How many ip address explanation given in the picture

solved 5 question,really sorry for that

please post remaining question, i would love to answer

all the best