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CCNP Switch > CCNP switch slides 12 > Flashcards

CCNP switch slides 12 Flashcards

1
Q

source

A

http://www.coursehero.com/flashcards/430760/CCNP-SWITCH-642-813-InterVLAN-routing/

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2
Q

What are the two types of port queues on a switchport?

A

ingrees queues, and egress queues.

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3
Q

What three decisions must be made after the switch processes the ingress queue?

A

Where to forward the frame, where it should be forwarded, and how. All happen simultaneously.

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4
Q

What is the FIB in multilayer switching?

A

The FIB is the Forwarding Information Base, and is a table of layer-3 routing information used to hardware switch packets. It contains the next hop address for each entry.

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5
Q

What table contains the Layer 2 information for every next-hop entry in the FIB?

A

The adjacency table.

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6
Q

What two components are part of the TCAM operation?

A

Feature Manager and Switching Database Manager.

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7
Q

What is another name for Topology-based Multilayer switching?

A

Cisco Express Forwarding (CEF).

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8
Q

By default how long are CAM table entries kept before they are deleted?

A

300 seconds.

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9
Q

What are the name differences between the Layer-3 and Layer-2 forwarding tables?

A

-Layer-2 is the CAM.-Layer-3 is the FIB.

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10
Q

What is the max cable length of most X-BASE-T wiring?

A

100m (328 ft)

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11
Q

ACLs on a switch can identify frames based on what 5 features?

A

MAC address, non-IP protocol types, IP Addresses, Protocols, and Layer-4 port numbers.

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12
Q

What is ARP throttling, or throttling adjacency mean?

A

That until an APR reply is received, additional ARP requests will dropped so they don’t fill up the input queues.

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13
Q

If a switch receives a frame and the source MAC is not in it’s forwarding table, what information will be stored about the new frame?

A

The MAC address, the switch port, and the VLAN on which it arrived.

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14
Q

TCAM entries are organized by which of its three components?

A

Mask.

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15
Q

What three things are contained in the Hex-value when looking at the FIB adjacency table?

A

-The first 6 octets are the Hex value of the next hop MAC address.-the second 6 octets are the Source MAC for the layer 3 engine interface (like VLAN 99).-the last two octets are the EtherType (0800 for Ethernet).

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16
Q

If an error is detected on a switchport what happens to it?

A

It is placed in the errdisable state, and disabled.

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17
Q

Will a FIB contain host routes (/32) entries?

A

Yes. Even though most routing tables do not (unless manually configured) the FIB does.

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18
Q

What are the four types of adjacency’s that can be found in the FIB adjacency table?

A

Null, Drop (actual error), Discard (ACL or policy), and Punt.

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19
Q

What are the two techniques of CEF that use specialized hardware?

A

-aCEF, functions as a FIB cache.-dCEF, has its own FIB table and forwarding engine!

20
Q

Within a frame, what does an Ethernet switch use to make decisions about forward frames?

A

The destination MAC address.

21
Q

What is the command to view the FIB?

A

(exec)show ip cef

22
Q

What is a ‘CEF Glean’?

A

When a L3 forwarding engine cannot forward a packet because of missing L2 info, the time it takes to have the L3 engine generate an ARP request and figure out the L2 information is the CEF Glean.

23
Q

What is an LOU and when is it used?

A

Logical Operation Unit, used when an ACL line uses a port operator like gt, lt, or range. The Feature Manager uses this to compile the TCAM entry for the ACL.

24
Q

What command establishes a DHCP relay to another network?

A

(if)ip helper-address IP

25
Q

In multilayer switching, what 4 specific decision are made simultaneously to forward data?

A

-The L2 forwarding table(CAM)-The L3 forwarding table(FIB)-Security ACLs.-QoS ACLs.

26
Q

What are the two types of multilayer switching (MLS)?

A

-Route caching, basically route-once-switch-many.-Topology based, uses the layer-3 routing table (called FIB) to make a forwarding decision.

27
Q

What is the DHCP DORA process?

A

Discover (any servers), Offer (address info), Request (to use the offer), ACK (that its ok to use the offer).

28
Q

What is unknown unicast flooding?

A

When a switch receives a frame and the destination MAC is not in its forwarding table, it forwards the message (or floods) out all ports on the same VLAN as the source.

29
Q

What is the IEEE standard for 10 GigE?

A

802.3ae

30
Q

When multilayer switching, what information must be changed in the packet and frame, by the packet rewrite engine, before the data can be forwarded out a port?

A

The L2 source and destination MAC, the L3 TTL and L3 header checksum, and the L2 checksum.

31
Q

If set to automatic recovery, an errdisabled port will stay down for how long? What is the range for configuring this time?

A

300 seconds, and 30-86,400 seconds.

32
Q

In topology-based multilayer switching, is the shortest or longest match used as the layer-3 destination?

A

The LONGEST match is always considered the best match.

33
Q

In a switch, what is the CAM?

A

Content-Addressable Memory, or the address table. It holds the MAC, egress port, VLAN ID, and a time stamp.

34
Q

What are TCAM entries composed of?

A

-Values, Mask, and Result (VMR) combinations.-Values are 134-bit, containing source and dest IP address and protocol information. -Masks are 134-bit (self explanatory)-Results are numeric values that represent what action to take.

35
Q

What is the IEEE standard for Gigabit Ethernet? (over copper)

A

802.3ab

36
Q

What 5 basic commands are needed to configure DHCP on a multilayer switch?

A

ip dhcp exclude-address START ENDip dhcp pool NAMEnetwork IP MASKdefault-router IP1 IP2 IP3 etc…lease [infinite, D H M)

37
Q

What is the IEEE standard for FastEthernet?

A

802.3u

38
Q

When a packet is ‘punted’ what does this mean?

A

That the packet was unable to be forwarded naturally and is sent to the switch CPU for process switching.

39
Q

Each TCAM mask can have/has how many values associated with it?

A

8 Values for each Mask

40
Q

Is duplex autonegotiation possible on Gigabit Ethernet?

A

No, because Gigabit Ethernet is, by definition, Full Duplex.

41
Q

What are the 9 reasons that a packet can be ‘punted’?

A

-ARP requests and replies-IP packets needing a response (TTL, MTU, frag-IP broadcasts-Routing protocol updates-CDP packets-IPX routing packets-Packets needing encryption-Packets triggering NAT-Non-IP and non-IPX packets.

42
Q

What does the Switching Database Manager do in TCAM?

A

It configures and manages TCAM partitions.

43
Q

What is the IEEE standard for Gigabit Ethernet? (over fiber)

A

802.3z

44
Q

What are the two Physical classifications of 10 GigE?

A

-LAN PHY, Connects switches, usually in the Core layer.-WAN PHY, Connects to SONET or SDH networks, typically in MANs.

45
Q

What does the Feature Manager do in the TCAM?

A

It merges any ACLs into the TCAM table so that it can be processed at hardware speeds.

CCNP Switch (16 decks)

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