It 377 Quaddour

What are the transition strategies from IPV4 to IPV6?

1. Dual Stack 2. Tunneling 3. Header Translation

If IP fragmentation occurred during IP packet delivery, which of the following network component will conduct reassembly? a. Only the receiver b. The last router before the receiver c. Egress switch d. It depends on MTU of a physical link

A

The highest-level DNS servers are called ________. A) root servers B) first-level or top-level servers C) Both A and B D) Neither A nor B

A

The network service based on Address Resolution Protocol provides: a. Layer 3 to layer 2 mapping b. Layer 2 to layer 1 mapping c. Layer 3 to layer 1 mapping d. Layer 2 to layer 3 mapping e. None of above

A

What happens if two nearby access points use the same channel? A) They will interfere with each other. B) They will be bonded for joint operation automatically. C) They will be bonded for joint operation automatically if they use CSMA/CA+ACK. D) They will be bonded for joint operation automatically if they use RTS/CTS.

A

What is the min size of the 802.11 frame body (payload)? a. 0 b. 16 c. 46 d. 64 e. depend on 802.11a or 802.11b

A

we set up a DNS server for the domain .it.ilstu.edu, we need register this DNS server to the server responsible for the domain: a. .ilstu.edu b. .edu c. DNS root servers d. ICANN e. All of the above

A

802.11a supports ________ non-overlapping channels. A) 1 B) 3 C) 7 D) More than 8

D

Channels with wide bandwidths are called ________ channels. A) single-mode B) multimode C) full-duplex D) broadband E) modulated

D

Each address in the following IP address class represents a group of hosts that all listen to one sender a. Class A b. Class B c. Class C d. Class D e. Class E

D

If /14 is a subnet mask, how many bits are there in the host part? A) 8. B) 14. C) 16. D) 18. E) We cannot say.

D

In DNS, a group of resources under the control of an organization is called a ________. A) network B) subnet C) scope D) domain

D

The network allocation vector (NAV) is really a ____________ that serves to avoid collisions on the Ethernet network. a. traffic cop b. compiler c. organizer d. timer

D

The total range of possible 802.11 WLAN frequencies in the 2.4 GHz band constitutes ________. A) a frequency spectrum B) a broadband C) a channel D) a service band E) All of the above.

D

What are the 3 types of IPv6 addresses

Unicast Multicast Anycast

Four step process for DHCP Conversation to get IP address:

a. Client sends Discover "Someone send me an address". This is a broadcast. b. Servers Offer "Use this address". c. Client Requests "I'll use this one". (broadcast) d. Servers Acknowledge "OK or No Way!" (ACK/NAK)

Mention only two of VLAN characteristics:

• A VLAN allows a group of stations to communicate as if they were on same broadcast • domain, even though they are separated from each other spatially (not necessarily on same switch) • Allows different groups of stations on a switch to be isolated from each other • Provides segmentation of network

Which wireless access method is better at supporting time-sensitive applications? a. ACF b. DCF c. ECF d. PCF e. XCF

D

If /14 is a subnet mask, how many bits are there in the network part? A) 8. B) 14. C) 16. D) 18. E) We cannot say.

E

If /14 is a subnet mask, how many bits are there in the subnet part? A) 8. B) 14. C) 16. D) 18. E) We cannot say.

E

Internet Corporation for Assigned Names and Numbers (ICANN): a. Is a non-profit organization to maintain and assign IP addresses. b. Determines what new Top-Level Domains will be created (.biz? .jobs?) c. Determine what groups can register domain names d. All of the above e. A&b

E

Which of the following uses OFDM? A) 802.11g. B) 802.11n. C) 802.11b D) All of the above E) Both A and B

E

In WLAN topology, (BSS) stand for Basic Service Set and ESS stand for Enhanced Service Set (ESS).

F(Extended)

An Address Resolution Protocol (ARP) is a static mapping method that finds a physical address, when given an IP address.

False

Network layer is responsible for providing end-to-end error control.

False

802.11b uses FHSS as an access technology, operates on the frequency of 2.4GHz, and has max data rate of 11Mbps.

False (DSSS)

In Frequency Hopping Spread Spectrum (FHSS), each bit (0 or 1) from the user data is replaced by a sequence of bits, called chip code, and then sent out.

False (DSSS)

There are two access methods in WLAN, Point Coordination Function (PCF: use CSMA/CA) and Distributed Coordination Function (DCF: use Polling access)

False (opposite of that)

In WLAN topology, (BSS) stand for Basic Service Set and ESS stand for Enhanced Service Set (ESS).

False(Extended)

802.11g uses DSSS as an access technology, operates on the frequency of 2.4GHz, and has max data rate of 54Mbps.

False(OFDM)

Routing decision is based on source IP address

False(destination IP)

Streamlined

Fragmentation fields moved out of base header IP options moved out of base header Header Checksum eliminated Header Length field eliminated Length field excludes IPv6 header

Summary of headers in both Pv6 and IPv4

Streamlined Revised Extended

Anycast

Address of a set of interfaces Delivery to a single interface in the set

Multicast

Address of a set of interfaces Delivery to all interfaces in the set

Extended

Flow Label field added

Unicast

One address on a single interface Delivery to single interface

Revised

Time to Live ' Hop Limit Protocol ' Next Header TOS ' Traffic Class Addresses increased 32 bits ' 128 bits

Briefly describe how ARP protocol works.

ARP is a protocol for determining a network host's MAC address when only its IP is known. a. ARP Request containing IP address is broadcast on a subnet (using the MAC all 1s broadcast destination address). b. ARP Reply is sent by device that recognizes its IP address in the ARP Request. c. IP Address/MAC Address pairs are cached (in ARP Table) by the sender so ARP Request does not need to be re-sent.

What are the two operational modes of 802.11-based WLAN? a. Point-to-point and mesh b. point-to-point and broadcast c. point-to-point and infrastructure d. ad hoc and infrastructure e. ad hoc and network

D

In IP subnet planning, you need to have at least 130 subnets. How large should your subnet part be? a. 6 bits. b. 8 bits. c. 14 bits. d. 16 bits. e. None of the above.

B

Routing decision is based on: a. Source IP address b. Destination IP address c. Source MAC address d. Destination MAC address e. Routing protocols

B

Which layer does DHCP protocol belong to? a. Network layer b. Application layer c. Transport layer d. Data link layer e. Session layer

B

Which layer does DNS protocol belong to? a. Network layer b. Application layer c. Transport layer d. Data link layer e. Session layer

B

Why is CSMA/CD not applicable to WLAN? a. There is no collision on WLAN. b. Collision signal cannot be detected. c. CSMA/CA chip is cheaper than CSMA/CD chip. d. CSMA/CA was standardized first and it was too late to change. e. Vendors preferred CSMA/CA over CSMA/CD.

B

When n=27 in "/n" or CIDR notation, how many valid IPs are available to be assigned to individual network interfaces? a. 32 b. 16 c. 4 d. 30 e. 64

D

Which of the following statement about IP address assignment is true? a. Any IP address from Class A, B, C, D, E can be assigned to an individual host b. ISU public IP addresses belong to Class C c. 10.10.1.0 represents a bigger network with more IP addresses than the one represented by 192.168.1.0 d. IP addresses from Class D and E cannot be assigned to any individual host

D

802.11n is designed to operate in the ________ unlicensed band. A) 2.4 GHz B) 5 GHz C) Both A and B D) Neither A nor B

C

In the mask 255.255.255.0, how many 1s are there? A) 8. B) 16. C) 24. D) 255. E) None of the above.

C

The ARP protocol operates at the ______ layer. a. application b. data link c. network d. transport e. All of the above.

C

What is Network Allocation Vector (NAV)? a. A WLAN control message b. A WLAN equipment c. A timer to inform other station to wait d. A WLAN encryption protocol e. A WLAN authentication protocol

C

Which of the following can offer speeds of about few gigabits per second? A) 802.11g. B) 802.11n. C) 802.11ac. D) None of the above. E) B&C

C

Which of the following layer is responsible for providing end-to-end network reachability? a. Physical layer b. Data link layer c. Network layer d. Transport layer e. Application layer

C

802.11 Release date Frequency Bandwidth Date rate MIMO Modulation Distance Indoor Distance outdoor

Release date 1997 Frequency 2.4 Bandwidth 22 Date rate 1-2 MIMO N/A Modulation DSSS/FHSS Distance Indoor 20 Distance outdoor 100

802.11b Release date Frequency Bandwidth Date rate MIMO Modulation Distance Indoor Distance outdoor

Release date 1999 Frequency 2.4 Bandwidth 22 Date rate 1-11 MIMO N/A Modulation DSSS Distance Indoor 38 Distance outdoor 140

802.11a Release date Frequency Bandwidth Date rate MIMO Modulation Distance Indoor Distance outdoor

Release date 1999 Frequency 5 Bandwidth 20 Date rate 6-54 MIMO n/a Modulation OFDM Distance Indoor 35 Distance outdoor 120

802.11g Release date Frequency Bandwidth Date rate MIMO Modulation Distance Indoor Distance outdoor

Release date 2003 Frequency 2.4 Bandwidth 20 Date rate 6-54 MIMO N/A Modulation OFDM Distance Indoor 38 Distance outdoor 140

802.11n Release date Frequency Bandwidth Date rate MIMO Modulation Distance Indoor Distance outdoor

Release date 2009 Frequency 2.4 / 5 Bandwidth 20& 40/20&40 Date rate290-600/347-800 MIMO 4/4 Modulation OFDM Distance Indoor 70/35 Distance outdoor 250

802.11ad Release date Frequency Bandwidth Date rate MIMO Modulation Distance Indoor Distance outdoor

Release date 2012 Frequency 60 Bandwidth 2160 Date rate up to 6700 MIMO N/A Modulation OFDM Distance Indoor 3.3 Distance outdoor

802.11ac Release date Frequency Bandwidth Date rate MIMO Modulation Distance Indoor Distance outdoor

Release date 2013 Frequency 5 Bandwidth 80&160 Date rate 290-6900 MIMO 4&8 Modulation OFDM Distance Indoor 35 Distance outdoor

802.11ah Release date Frequency Bandwidth Date rate MIMO Modulation Distance Indoor Distance outdoor

Release date Dec 16 Frequency .9 Bandwidth 1-16 Date rate up to 347 MIMO 4 Modulation OFDM Distance Indoor 45 Distance outdoor 150

802.11ax Release date Frequency Bandwidth Date rate MIMO Modulation Distance Indoor Distance outdoor

Release date Dec 18 Frequency 2.4 & 5 Bandwidth 80 & 160 Date rate 27600 MIMO 4 & 8 Modulation OFDM Distance Indoor 10 Distance outdoor

802.11ay Release date Frequency Bandwidth Date rate MIMO Modulation Distance Indoor Distance outdoor

Release date Nov 19 Frequency 60 Bandwidth 8000 Date rate 20000 MIMO 4& 8 Modulation OFDM Distance Indoor 10 Distance outdoor 100

802.11a uses OFDM as an access technology, operates on the frequency of 5GHz, and has max data rate of 11Mbps.

True

802.11ac uses OFDM, operates on the frequency of 5GHz, and has max data rate of 6.9Gbps.

True

802.11n operates on the frequency of 2.4G and 5GHz and has max data rate of 600Mbps.

True

An ARP reply is unicast to the host requesting the mapping.

True

An ARP request is broadcast to all devices on the network.

True

An access point (AP) is required to connect a WLAN to a wired network.

True

An access point ensures that all computers within range of the access point can communicate with each other .

True

Classless Inter-Domain Routing (CIDR) eliminates concept of Class A, B, C, classful network addresses and Supports route aggregation.

True

Delivery of a packet to a host or router requires two levels of addresses: logical and physical.

True

Each AP defines a network access service area; Service Set ID (SSID) is the name of the AP area.

True

IP is the most commonly used protocol and therefore the most reliable connectionless protocol responsible for source-to-destination delivery.

True

IP v6 has a fixed header length of 40 bytes, 32 bytes for the address and only 8 bytes for the header details.

True

If IP fragmentation occurred during IP packet delivery, only receiver conducts reassembly.

True

Individual throughput falls as the number of wireless hosts using an access point increases.

True

The network allocation vector (NAV) is a timer for collision avoidance.

True

The physical layer methods used by wireless LANs include frequency-hopping spread spectrum (FHSS), direct sequence spread spectrum (DSSS), orthogonal frequency-division multiplexing (OFDM) and a high-rate direct sequence spread spectrum (HR-DSSS).

True

There are two operational modes of 802.11-based WLAN, ad hoc and infrastructure.

True

Two types of network connections exist: they are connection-oriented and connectionless.

True

When a network mask is applied to any IP address on the network, the result is the IP address' network part followed by zeros.

True

When a station WS1 sends RTS or CTS, other stations (WS2 and WS3) on the system start NAV timer, which have to wait NAV before checking if channel is free

True

Wireless Personal Area Network (PAN) 802.15.1 uses FHSS, operate on the frequency 2.4GHz, and with low data rate of less the 1Mbps.

True

Zone in DNS may contain a domain or part of a domain and a name server may be authoritative for more than one zone.

True