Networking (4) Flashcards
Your network is currently running on a mix of 802.1.1b and 802.1.1g devices. At the end of the year, you have extra budget to upgrade some, but not all, of the wireless infrastructure. You want to upgrade to the newest technology but still maintain backward compatibility. Which standard should you choose?
- 1.1g
- 1.1r
- 1.1n
- 1.1n
- 11b/g transmit in the 2.4 GHz frequency, as does 802.11n, so they are compatible. The newer 802.11ac is a 5 GHz standard and therefore is not backward compatible with 802.11b/g. 802.11r is not a standard related to Wi-Fi speed and is not in the A+ exam objectives
You are consulting with a small office that needs a dedicated. digital point-to-point network connection to its parent office. Which internet connection type will meet this requirement?
Dial-up
DSL
ISDN
ISDN
Integrated Services Digital Network (ISDN) is a digital, point-to-point network capable of maximum transmission speeds of about 2 Mbps, although speeds of 128 Kbps are more common
What type of network spans multiple buildings or offices but is confined to a relatively small geographical area?
WAN
PAN
MAN
MAN
Networks that are larger than a LAN but confined to a relatively small geographical area are metropolitan area networks (MANs). A MAN is generally defined as a network that spans a city or a large campus
Which of the following shorthand notations corresponds to the CIDR subnet mask 255.255.224.0?
/19
/20
/21
/19
A subnet mask of 255.255.224.0 has eight bits in each of the first two octets set to on, and it has three bits in the third octet on. Therefore, it corresponds to /19 in shorthand
You are configuring hosts on a network IPv4. Which elements are required for the computer to connect to the network?
IP address
IP address and subnet mask
IP address and subnet mask, and default gateway
IP address and subnet mask
To communicate on an IPv4 network, a host must be configured with a valid IP address and a subnet mask. A default gateway is needed only if the host will connect to a remote network. DNS servers are optional but useful, because they resolve hostnames to IP addresses
Which TCP/IP protocol was developed by Microsoft and has been the default file and print sharing protocol on Windows-based computers since Windows 2000?
CIFS
SMB
FTP
CIFS
Common Internet File System (CIFS) is a Microsoft-developed enhancement of the SMB protocol, which was also developed by Microsoft. The intent behind CIFS is that it can be used to share files and printers between computers, regardless of the operating system that they run. It’s been the default file and print sharing protocol on Windows-based computers since Windows 2000
Which of the following statements regarding IPv4 configuration is true?
All hosts on a network must have a unique subnet mask
All hosts on a network must have a default gateway
All hosts on a network must have a unique host address
All hosts on a network must have a unique host address
All hosts on a network must have a unique IP address. The subnet mask should be the same for all computers on a local network. The network ID can’t be set to all 1s; otherwise, it replicates the subnet mask. Default gateways, or router addresses, are needed only if hosts will communicate with hosts outside their local network
Which Wi-Fi encryption standard uses a static key, which is commonly 10, 26, or 58 character long?
WPA2
TKIP
WEP
WEP
Wired Equivalent Privacy (WEP) was one of the first security standards for wireless devices. It uses a static key; the keys are commonly 10, 26, or 58 hexadecimal characters long
Which TCP/IP port number does SNMP use?
UDP 143
TCP 161
UDP 161
UDP 161
Simple Network Management Protocol (SNMP) is a noncritical service, so it uses UDP. It’s assigned port 161. IMAP4 uses port 143
Because of recent security breach, your IT team shut down several ports on the external firewall. Now, users can’t get to websites by using their URLs, but they can get there by using IP addresses. What port does the IT team need to open back up to enable internet access via URLs?
53
67
80
53
Clients are unable to get to the DNS server, which resolves hostnames (or URLs) to IP addresses. DNS uses port 53
All your network hosts are configured to use DHCP. Which IP address would indicate that a host has been unable to locate a DHCP server?
- 168.1.1
- 16.1.1
- 254.1.1
169.254.1.1
Automatic Private IP Addressing (APIPA) is a TCP/IP standard used to automatically configure IP-based hosts that are unable to reach a DHCP server. APIPA addresses are in the 169.254.0.0/16 range. If you see a computer that has an IP address beginning with 169.254, you know that it has configured itself
A technician is trying to establish a dial-up network connection using a legacy modem. What is the fastest data throughput for a modem?
28.8 Kbps
56 Kbps
4 Mbps
56 Kbps
The fastest modems produced had a data rate of 56 Kbps. At the time, they were considered fast. Today, not so much
You have reason to believe that several network users are actively browsing prohibited content on unsecured sites on the internet.. Which port can you disable on the firewall to immediately stop access to these websites?
67
80
443
80
Normal (unsecured) websites are accessed on port 80, which is the port that Hypertext Transfer Protocol (HTTP) uses. Shut it down, and no one will be able to access websites, except secure sites that use HTTPS, which is on port 443
Which TCP/IP protocol is designed to help resolve hostnames to IP addresses?
ARP
RARP
DNS
DNS
The Domain Name System (DNS) is responsible for resolving hostnames to IP addresses. This is used millions of times daily on the Internet; when someone types in a website name, such as www.sybex.com, DNS will resolve that to an IP address to enable communication
You need to install a internet connection for a forest ranger outlook tower, located far away from electrical lines. Which option would be best for broadband internet access?
Cable
DSL
Satellite
Satellite
Satellite Internet is not much like any other type of broadband connection. Instead of a cabled connection, it uses a satellite dish to receive data from an orbiting satellite and relay station that is connected to the Internet. Because it requires a clear line of sight between the transmitter and receiver, it can be referred to as “line of sight” wireless. For an installation far from civilization, it may be the only option
