Chapter 2 Models, Ports, Protocols and Network Services Flashcards
Which of the following commands is used within FTP to change the working directory on the local host?
cd
rcd
mgo
lcd
LCD
The lcd command is used within FTP to change the working directory on the local host (cd does it on the remote host). The other command options given do not exist in FTP.
NTP uses a hierarchical, semi-layered system of time sources wherein each level of the hierarchy is termed a
Stratum
Relay
Lease
Scope
Stratum
NTP uses a hierarchical, semi-layered system of time sources wherein each level of the hierarchy is termed a stratum. Each stratum/level is assigned a number starting with zero for the reference clock at the top and incrementing from there with the number representing the distance from the reference clock: this means that a server synchronized to a stratum n server runs at stratum n + 1. All other choices presented (Lease, Relay, and Scope) are associated with DHCP and not with NTP.
Traffic is not being allowed through port 3389 of the firewall. Which TCP or UDP protocol is associated with that port by default?
SSH
HTTPS
SMTP
RDP
NetBIOS
SIP
RDP
Port 3389, by default, is associated with RDP. Port 443 is associated with HTTPS by default, whereas port 22 is associated with SSH, port 25 is associated with SMTP, ports 137–139 are associated with NetBIOS, and ports 5060 and 5061 are associated with SIP.
At which layer of the OSI model does STP operate?
Data link
Transport
Session
Presentation
Layer 2 Datalink Layer
Protocols and technologies such as Spanning Tree Protocol (STP) operate at the data link layer.
Which of the following protocols operates, by default, on port 22?
DNS
SMTP
SSH
TFTP
SSH
Which of the following services provides name resolution services for FQDNs?
ARP
DNS
WINS
DHCP
DNS
The Domain Name System/Domain Name Service (DNS) resolves fully qualified domain names (FQDNs) to IP addresses. Dynamic Host Configuration Protocol (DHCP) provides automatic IP address assignment. The Windows Internet Name Service (WINS) provides NetBIOS computer name to IP address resolution. Address Resolution Protocol (ARP) resolves IP addresses to MAC addresses.
Which of the following protocols enable client systems to access and run applications on a remote system, using that system’s resources?
CAI
MOU
RDP
SOW
RDP
The Remote Desktop Protocol (RDP) enables client systems to access and run applications on a remote system, using that system’s resources. Only the user interface, keystrokes, and mouse movement are transferred between the client and server computers.
You are attempting to configure a client’s email program. The user can receive mail but cannot send any. In the mail server configuration screen of the mail application, you notice that the Type of Outgoing Mail Server field is blank. This explains why the client cannot send mail. Which of the following protocols are you most likely to enter as a value in the Type of Outgoing Mail Server field?
POP3
IMAP4
HTTPS
SMTP
STMP
SMTP is used to send email and is a protocol within the TCP/IP protocol suite. POP3 and IMAP4 are email retrieval protocols, not protocols for sending email. HTTPS is not used to send or retrieve email.
At which layer of the OSI model does RTP operate?
Presentation
Transport
Application
Data link
Application Layer, Layer 7
Protocols and technologies such as Real-time Transport Protocol (RTP) operate at the application layer.
Which of the following DNS record types is a pointer to the canonical name, which is used to perform a reverse DNS lookup?
CNAME
NS
PTR
MX
PTR
A PTR record is a pointer to the canonical name, which is used to perform a reverse DNS lookup, in which case the name is returned when the query originates with an IP address.
Traffic is not being allowed through port 53 of the firewall. Which TCP or UDP protocol is associated with that port by default?
DHCP
DNS
IMAP
RDP
DNS
Port 53 is associated with DNS, by default.
Port 3389, by default, is associated with RDP, whereas
port 143 is associated with IMAP, and
ports 67 and 68 are associated with DHCP.
Which of the following protocols operates, by default, on ports 5060 and 5061?
RDP
SIP
SMB
DHCP
SIP
By default, SIP operates at ports 5060 and 5061.
SMB operates at port 445,
DHCP at ports 67/68, and
RDP at port 3389.
Which layer of the OSI model is responsible for converting data from the application layer into a format that can be sent over the network?
Transport
Network
Presentation
Session
Presentation
The presentation layer converts data from the application layer into a format that can be sent over the network. The session layer synchronizes the data exchange between applications on separate devices. The transport layer establishes, maintains, and breaks connections between two devices. The network layer provides mechanisms for the routing of data between devices across single or multiple network segments.
What are logical groupings of SNMP systems known as?
Nodes
Pairs
Mirrors
Communities
Communities
SNMP communities are logical groupings of systems. When a system is configured as part of a community, it communicates only with other devices that have the same community name.
What are SNMP databases called?
WINS
Agents
MIBs
HOSTS
MIBs
SNMP uses databases of information called MIBs to define what parameters are accessible, which of the parameters are read-only, and which can be set.
