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Ethernet Technologies

Subject : it-skills

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
Match each statement with the correct term.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What type of packets can not be forwarded by CEF but are instead sent to the switch CPU for process switching in software?
Switch#show running-config interface {interface}
SVI
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
Content-Addressable Memory

2. What is the name of physical network segment where data packets can collide with one another when being sent?
Tunnel
Collision domain
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Switch(config)#interface {type}{module}/{number}

3. How do Layer 2 switches provide isolation between hosts?
A switch port that has been shut down automatically due to a serious error condition
Cabling specifications for Gigabit Ethernet
Value - Mask - and Result (VMR)
Per port collision domains; Full duplex mode; Dedicated bandwidth; Error detection; Broadcast thresholds; Intelligent filtering and forwarding

4. What is the maximum cabling distance for 10GBASE-SR/SW?
GBIC-to-GBIC connection between stacking Catalyst switches or between any two Gigabit switch ports over a short distance
Layer 2 destination address changed to next-hop MAC address; Layer 2 source address changed to outbound interface MAC address; Layer 3 TTL decremented by 1; Layer 3 IP checksum recalculated; Layer 2 frame checksum recalculated
Switch(config-if)#switchport access vlan {vlan}
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF

5. Displays a list with status of all interfaces
Entry not in FIB; FIB table full; IP TTL expired; MTU exceeded; ICMP redirect; Unsupported encapsulation; Tunnelled packets requiring compression or encryption; Access list with 'log' option; NAT must be performed
Cabling specifications for Gigabit Ethernet
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
Switch#show interfaces status

6. Displays the entire Forwarding Information Base (FIB)
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Switch(config-if)#no ip route-cache cef
10GbE operates only at full duplex
Switch#show ip cef

7. What is half duplex operation?

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8. Displays error-disabled detection status
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
With a mask value in addition to binary values to decide which keys in a table are relevant
Switch#show errdisable detect
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX

9. What is the default age-out time for stale entries in the CAM table?
IEEE 802.3u
Switch(config)#errdisable detect cause bpduguard
300 seconds
100 metres

10. What are the default error-disable detection causes?
Enable error-disable for all possible causes
Switch#show errdisable recovery
American National Standards Institute
Switch(config-if)#shutdown

11. What is ANSI?
The Drop adjacency
The CEF epoch number
American National Standards Institute
CEF glean

12. Sets the administrative mode of a switch port to access
Switch(config)#errdisable detect cause rootguard
Switch(config-if)#switchport mode access
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
On

13. How are packets marked before being sent to the CEF Layer 3 engine for further processing?
SVI
CEF punt
Switch(config)#errdisable detect cause udld
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)

14. What is the name of the switching technology where good frames are received - stored for inspection and then forwarded?
Compiling Access Control Entries (ACE) into the TCAM table
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch(config)#errdisable detect cause channel-misconfig
Store-and-forward

15. What is the operational mode of a switch port that is a member of one VLAN?
Static access
7 100BASE-T2 full duplex; 6 100BASE-TX full duplex; 5 100BASE-T2 half duplex; 4 100BASE-T4; 3 100BASE-TX; 2 10BASE-T full duplex; 1 10BASE-T
Switch(config)#errdisable detect cause vmps
Source MAC (/48); Destination MAC (/48); Ethertype (/16)

16. What is the operational mode of a switch port that uses DTP negotiation?
Switched virtual interface (SVI)
Static access or trunk
Switch#show running-config interface {interface}
Switch#show ip cef {interface} [detail]

17. What are the reasons for packets being dropped by CEF?
R = LAN PHY; W = WAN PHY
Switch(config-if)#no switchport
Switch(config)#errdisable detect cause ilpower
Encapsulation failure; Unresolved address; Unsupported protocol; No valid route; No valid adjacency; Checksum error

18. How does the IEEE 802.3ae standard differ from its predecessors at the physical layer?
10GbE operates only at full duplex
Switch(config)#interface range macro {name}
70 km for 9 micron SMF; 100 km for 8 micron SMF
1000BASE-T full duplex followed by 1000BASE-T half duplex

19. What are the classes of Physical Media Dependent (PMD) interfaces defined by IEEE 802.3ae?
Process the first packet in a traffic flow to determine the destination
Switch(config)#errdisable detect cause gbic-invalid
Collision domain
LAN PHY and WAN PHY

20. What is the operational mode of a switch port that carries transparent Layer 2 VPNs?
Tunnel
From 30 seconds to 86 -400 seconds (24 hours)
Source IP (/32); Destination IP (/32); Protocol (/16); ICMP code (/8); ICMP type (/4); IP type of service (ToS) (/8)
Switch(config)#errdisable detect cause storm-control

21. What is the DTP negotiation mode of a switch port configured as static access?
Off
Fast Ethernet over 2 pairs EIA/TIA Category 3 - 4 - 5 UTP
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}

22. What are the duplex modes of a GigaStack GBIC?
Carrier Sense Multiple Access Collision Detection
Full duplex if only one of the two stacking connectors is used; Half duplex over a shared bus if if both connectors are used
Switch(config-if)#description {string}
Switch(config)#mac address-table aging-time {seconds}

23. Selects an interface-range macro and enters interface configuration mode
The CEF epoch number
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch(config)#errdisable detect cause pagp-flap
Switch(config)#interface range macro {name}

24. What is the timer range for automatic re-enabling of error-disabled ports?
Switch(config-if)#no switchport
From 30 seconds to 86 -400 seconds (24 hours)
Cabling specification for 10 Mbps Ethernet over Unshielded Twisted Pair (UTP) cabling
Switch(config)#interface range macro {name}

25. What is the standard for 10 Gigabit Ethernet (10GbE)?
IEEE 802.3ae
Switch(config)#errdisable detect cause storm-control
Switch(config)#errdisable recovery cause {all | {cause-name}}
Switch#show ip cef {network} [{mask}] [longer-prefixes] [detail]

26. When can a switch start to learn source MAC addresses on incoming ports?
Switch#show errdisable recovery
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state
Switch(config-if)#duplex {auto | full | half}
With MMF cables shorter than 100 metres (to prevent over-driving the far-end receiver) and with MMF cables longer than 300 metres (to lessen the effect of differential mode delay)

27. How is link duplex mode determined on Fast Ethernet links configured to autonegotiate?
Switch(config)#errdisable detect cause link-flap
Through exchange of information - which means that for one end to successfully negotiate duplex mode the other end must also be set to autonegotiate
Collision domain
Process the first packet in a traffic flow to determine the destination

28. Enables error-disable for conditions that trigger port security configured on a port
100BASE-TX - 100BASE-T2 - 100BASE-T4 and 100-BASE-FX
Switch(config)#errdisable detect cause psecure-violation
10 km
When the Spanning Tree Protocol (STP) has put the switch port in learning or forwarding state

29. What is the name of the CEF engine that maintains routing information in software?
Switch(config-if)#no ip route-cache cef
American National Standards Institute
The Layer 3 engine
On

30. What is TCAM overflow?
Switch(config)#errdisable detect cause dhcp-rate-limit
400 metres half duplex and 2000 metres full duplex
FIB with adjacency table
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries

31. Enables error-disable detection
Switch(config)#errdisable detect cause {all | {cause-name}}
Switch(config-if)#shutdown
Switch#show mac address-table [address {mac-address}] [interface {interface}] [vlan {vlan}]
Switch(config)#interface range macro {name}

32. Configures a switch port with a static access VLAN assignment
S = Short; L = Long; E = Extra-long
Switch(config-if)#switchport access vlan {vlan}
Switch(config)#mac address-table static {mac-address} vlan {vlan} interface {interface}
Switch#show errdisable detect

33. When do collisions occur?
Numeric values that represent what action to take after the TCAM lookup occurs
ARP requests and replies; IP packets requiring an ICMP response; IP broadcasts to be relayed; Routing protocol updates; CDP packets; Packets needing encryption; Packets triggering NAT; Other non-IP packets
When one station transmits at the same time as another on a shared medium
Tunnel

34. What are the supported duplex mode settings for Gigabit Ethernet on Cisco switches?
S = Short; L = Long; E = Extra-long
Route caching and topology based
American National Standards Institute
Full duplex only

35. What are the symptoms of a duplex setting mismatch between two ends of a link?
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
Cisco Express Forwarding
Switch(config)#errdisable detect cause l2ptguard
Slow response times - low throughput - runts and other input errors on the switch ports

36. Enables error-disable when an STP BPDU is received from a root bridge on an unexpected port
Switch(config)#errdisable detect cause rootguard
SC or MT-RJ
Switch#show cef drop
Numeric values that represent what action to take after the TCAM lookup occurs

37. Displays interface configuration information
Switch#show running-config interface {interface}
Source MAC address; Port of arrival; VLAN; Time stamp
Configure the appropriate values manually on both ends of the link
Switch(config)#errdisable detect cause gbic-invalid

38. What is LAN PHY used for?
Down - static access - trunk or tunnel
Accelerated CEF (aCEF) and Distributed CEF (dCEF)
Interconnecting switches in a campus network
Cabling specifications for Gigabit Ethernet

39. What is MLS?
Multilayer Switching
1000BASE-CX - 1000BASE-T - 1000-BASE-SX - 1000-BASE-LX/LH and 1000-BASE-ZX
Switch(config)#errdisable detect cause dhcp-rate-limit
Ingress queueing; Destination MAC lookup (CAM); Destination IP lookup (FIB); Security ACL lookup (TCAM); QoS ACL lookup (TCAM); Layer 3 packet rewrite; Egress queueing

40. Displays error-disabled recovery timer information
By electrical signalling so that either end of a link can determine what speed the other end is trying to use
The CEF epoch number
Packets that have been truncated before they were fully received
Switch#show errdisable recovery

41. What is an interface-range macro?
The CEF epoch number
Switched virtual interface (SVI)
A name assigned to a ranges of interfaces
Fast Ethernet over 4 pairs EIA/TIA Category 3 - 4 - 5 UTP

42. Enables automatic re-enabling of error-disabled ports
Multilayer Switching
Switch(config)#interface range {type}{module}/{number} [- {number}] [ - {type}{module}/{number} ...]
Switch#show errdisable detect
Switch(config)#errdisable recovery cause {all | {cause-name}}

43. What is 10GBASE-SR/SW?
Switch(config)#errdisable detect cause rootguard
10 Gigabit Ethernet over 50 or 62.5 micron MMF (850 nm serial laser)
10 Gigabit Ethernet over 9 micron SMF (1550 nm serial laser)
Switch(config)#errdisable detect cause security-violation

44. What information is recorded in CAM as frames arrive on a switch port?
Source MAC address; Port of arrival; VLAN; Time stamp
Switch#show adjacency [{interface}] [summary | detail]
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Ternary Content-Addressable Memory

45. What are the 100BASE-FX connectors used in Cisco Catalyst switches?
10 Gigabit Ethernet over 9 micron SMF (1310 nm serial laser)
SC or MT-RJ
66-300 metres for 50 micron MMF; 33 metres for 62.5 micron MMF
Incomplete adjacency; Incomplete ARP resolution; Unsupported packet features; ICMP redirect; Packets destined to the router itself; IP options present; Access list evaluation failure; Fragmentation failure

46. What are the 10GBASE-X PMD transceiver form factors used in Cisco Catalyst switches?
XENPAK - X2 - or SFP+
In parallel revealing the best (longest) match in a single table lookup
Listen to the first packet and put its resulting destination in the MLS cache; Route subsequent packets in the same flow based on the MLS cache
Switch(config)#no ip cef

47. Enables error-disable for errors with offering inline power
LAN PHY and WAN PHY
American National Standards Institute
Switch(config)#errdisable detect cause ilpower
Fast Ethernet over 62.5/125 micron multimode fibre (MMF) or 9 micron singlemode fibre (SMF)

48. Enables error-disable for errors with Layer 2 Protocol Tunnelling
Switch(config)#errdisable detect cause loopback
When there are more access list entries and Layer 4 operations than available Mask/Value and LOU entries
Switch(config)#errdisable detect cause l2ptguard
Switch(config)#errdisable detect cause dhcp-rate-limit

49. What is 1000BASE-SX?
Gigabit Ethernet over 1 pair 50 or 62.5 micron MMF (850 nm laser)
Switch(config)#define interface-range {macro-name} {type} {module}/{number} [- {number}] [ - {type} {module}/{number} ...]
Switch(config)#errdisable detect cause arp-inspection
Switch(config)#errdisable detect cause loopback

50. What is the DTP negotiation mode of a switch port configured as trunk?
CEF glean
On
Full duplex only
Switch(config-if)#no switchport