CCNA 4.0 - IP Services Flashcards
What two commands are necessary for a telnet/SSH user to see log messages?
1) logging monitor (global config)
2) terminal monitor (exec command)
What global config command will store log messages in RAM?
logging buffer
What global config command will send log messages to a Syslog server?
logging host (address) (hostname)
What command sets the time zone?
clock timezone
What command sets daylight savings?
clock summer-time
What command configures a device as an NTP server only?
ntp master (stratum-level)
What command configured a device as both an NTP server and NTP client?
ntp server (address | hostname)
What is the default NTP master stratum level?
8
True or false: CDP runs by default.
True
The default CDP timer is ____ seconds with a default hold time of ____ seconds.
60, 180
What global command enables LLDP on all interfaces?
lldp run
Instead of configuring LLDP globally, what commands enable LLDP on an interface?
lldp (transmit | receive)
The default LLDP timer is ____ seconds with a default hold time of ____ seconds.
30, 120
What command correlates an ACL with a NAT pool? Is this command global or per-interface?
ip nat inside source-list (acl-number) pool (pool-name)
globally configured
What command configures a NAT pool?
ip nat pool (name) (first address) (last address) netmask (mask) prefix-length (length)
What command enables PAT rather than NAT?
ip nat inside source-list (acl-number) interface (type/number) overload
Jitter is defined as…
variations in one-way delay between consecutive packets sent by the same application
What are the guidelines for delay, jitter, and loss for voice?
Delay: 150ms or less
Jitter: 30ms or less
Loss: 1% or less
What are the guidelines for bandwidth, delay, jitter, and loss for video?
Bandwidth: 384kbps to 20+ Mbps
Delay: 200-400ms
Jitter: 30-50ms
Loss: 0.1% - 1%
DSCP stands for…
Differentiated Services Code Point
NBAR stands for…
Network Based Application Recognition (an alternative to using ACLs to classify and mark traffic)
In what field in the IPv4 header is IPP/DSCP information written?
the ToS (Type of Service) field
The DSCP field contains how many bits?
6
The three bits of the 802.1Q header at layer 2 goes by two names. What are they?
Class of Service (CoS)
Priority Code Point (PCP)
TID is…
The QoS marking field in wifi
EXP is…
the QoS marking field over MPLS
With regard to trust, a user PC is typically ______ while their IP phone is _____.
Untrusted, trusted
By default, Cisco IP phones mark voice packets with what DSCP code?
EF (46) - expedited forwarding
By default, Cisco IP phones mark signaling packets with what DSCP code?
CS3
What does “Class Selector” represent?
a mapping between older IPP codes and newer DSCP codes
Class-Based Weighted Fair Queuing (CBWFQ) works by…
Allocating a specific percentage of guaranteed bandwidth to predefined queues
Which is better when shaping: a long time interval or short?
Short - this reduces delay and jitter
What command checks for an uncorrupted download of a Cisco IOS executable?
verify - performs an MD5 or SHA512 hash against the file
TFTP uses protocol/port…
UDP 69
FTP uses protocol/ports…
TCP 20, 21
